







$9.50 in coins 
20140115 

dana pose la question : you have $9.50 in coins. it has twice as many nickels as quarters and three times as many dimes as nickels. how many of each coin do you have? Penny Nom lui répond. 





Drawing three coins from 10 coins 
20110929 

Michelle pose la question : Three coins are chosen at random from a purse containing 6 dimes & 4 quarters. What is the probability that the selection will contain at least one quarter? Penny Nom lui répond. 





Three tangent circles 
20110819 

hanniel pose la question : two coin are tangent to a third coin internally and are tangent to each other
externally. The distance between their centers are 14 mm, 17mm, and 5mm.
find their radii Penny Nom lui répond. 





Four coins 
20110311 

Nestor pose la question : exact amount: philip has a quarter, a dime, a nickel, and a penny. for how many different prices could he give the exact amount? Penny Nom lui répond. 





12 coins 
20100707 

Eden pose la question : We have 12 coins same in size and shape and also weight.
But among these, one coin which has same size and shape, but not in weight
and we can't know that this coin was lighter or heavier.
We must decide which coin was lighter or heavier among these 12 coins in
4 times of weighting with scale. Stephen La Rocque and Tyler Wood lui répond. 





Sarim has $1 in coins. 
20091027 

Elizabeth pose la question : Here is the question asked: Sarim has $1 in coins. Onefifth of the coins are dimes, twofifteenths are nickels, and twothirds are pennies. Tell how many of each coin he has. I am not sure how to start this problem. Penny Nom lui répond. 





$6.25 in nickels quaters and dimes 
20091010 

miriam pose la question : a piggy bank contains $ 6.25 in nickles quaters and dimes.
there are 65 coins all together and there are four times as many nickles as quaters
find the number of coins of each kind Penny Nom lui répond. 





Tossing a penny 26 times 
20090804 

Basma pose la question : Jack is going ot toss a penny 26 times.
How many times should it land on heads? Robert Dawson lui répond. 





A bag of coins 
20090109 

marina pose la question : I have a bag of gold coins. I give 1/8 to mother then gave 1/2 of what was left to my brother
i give 2/7 of what was left to father. If i have 25 coins left. how many do i have originally. Robert Dawson and Penny Nom lui répond. 





50 coins with a value of $1.00 
20090108 

Ana pose la question : you have 50 coins which have a total value of 1.00. What are the coins and how many of each do you have? Robert Dawson lui répond. 





Nickels, dimes and quarters 
20081027 

val pose la question : I would like help working out a math word problem. A collection of 30 coins worth $5.50 consists of nickels, dimes, and quarters. There are twice as many dimes as nickels. How many quarters. Could you teach me how to find this formula? Penny Nom lui répond. 





Abby has 45 coins 
20080828 

Sonia pose la question : Use an algebraic approach to solve the problem. Abby has 45 coins, consisting only of dimes and quarters, worth $6.6. How many dimes and how many quarters does she have? Penny Nom and Victoria West lui répond. 





Lining up coins visually using geometry and trigonometry 
20071231 

Jessica pose la question : a) In what order would you arrange a penny, a nickel, a dime, a quarter, and a halfdollar so that they all have the same apparent size? The diameters of the coins, in thousandths of inches, are as follows: penny, 750; nickel, 835; dime, 705; quarter, 955; halfdollar, 1205.
b) How should the coins be placed, if the distance between the dime and the halfdollar is 100 units?
How far from thw dime should your eye be to see that all the coins have the same apparent size?
c) What angle do the coins subtend when they have the same apparent size? Stephen La Rocque lui répond. 





Nickels, dimes and pennies 
20071014 

tom pose la question : you have $1.00 and 1/5 of it is dimes, 2/15 is nickels, and 2/3 is pennies. How many coins of each are there. how do i set it up to solve this problem. thanks, tom Penny Nom lui répond. 





Coin jar 
20071007 

a student pose la question : Sally empties his jar of coins. It contains $3.75 in nickels, dimes, and
quarters. The number of dimes is twice the number of nickels and the number
of quarters is three less than the number of nickels. Determine how many nickels,
dimes, and quarters were in the in the jar. Stephen La Rocque lui répond. 





Weightng coins 
20070218 

Gary pose la question : You are considering buying 27 silver coins that look alike, but you have been told that one of the coins is a lightweight counterfeit. Find the least number of weighings on a balance scale that you can use to be certain you have found the counterfeit coin. Penny Nom lui répond. 





Nickels, dimes and quarters 
20070205 

Avinash pose la question : Mary has 48 coins made up of nickels, dimes and quarters with a total value of $5.10. She has 4 more dimes than nickels and quarters combined. How many coins of each kind does she have? Use matrix to solve the system Stephen La Rocque lui répond. 





Place value, coins and money 
20061212 

Emily pose la question : I was wondering what the best way would be to teach place value using coins and money. I have used base ten blocks already and am looking for a way to integrate money, perhaps on a place value chart and perhaps using decimals. Diane Hanson lui répond. 





A jar contains 36.25$ 
20060612 

Brunia pose la question : A jar contains 36.25$ in pieces of 0.10 and of 0.25$. If it there has 250 change pieces in all, how much there he has pieces of 0.25$ in the jar. Penny Nom lui répond. 





A triangle of 50p pieces 
20060222 

Stuart pose la question :
Ok, so i am collecting 50p pieces and arranging them on my desk in the shape of a triangle.
eg
50p
50p 50p
50p 50p 50p
50p 50p 50p 50p
I want to work out how much money I'm saving just by knowing how many rows of coins there are. If i can work out how many coins there are just by knowing how many rows I have I can just divide by 2 to find out the amount in dollars.
Penny Nom lui répond. 





112! 
20040528 

Beatriz pose la question : 1) A bus driver collects identical sets of 5 coins from each passenger. If the totoal colledted was $21.83, how many pennies did the driver get??
2) How many terminal zero in the base 10 expression of 112! (factional) N! means N(N1)(N2) .....(2) (1). Penny Nom lui répond. 





A counterfeit coin 
20040123 

Kim pose la question : You are considering buying 45 silver coins that look alike, but you have been told that one of the coins is a lightweight counterfeit. Find the least number of weighings on a balance scale that you can use to be certain you have found the counterfeit coin? Penny Nom lui répond. 





Arithmitic sequence 
20030201 

A student pose la question : I am having problems solving this arithmetic sequence... 1, 5, 10, ___, 50, 1.00, ___, 10.00, ... I believe the answers to be 25 and 5.00 but I can't figure why. Claude Tardif lui répond. 





A penny, a nickel, a dime, a quarter, and a loonie 
20030121 

Blaine pose la question : I have 5 coins: a penny, a nickel, a dime, a quarter, and a loonie. How many different amounts of money could I pay using any combination of these coins? Penny Nom lui répond. 





A coin is tossed 11 times 
20021031 

A student pose la question : There are 2 people that are playing a game in which a coin is tossed 11 times. The first player gets a point for a toss of heads. The 2nd player gets a point for a toss of tails. whoever gets 6 points wins. Suppose that so far the first player has 2 points and the second player has 4 points. What is the probability that the first player wins the game? Andrei Volodin and Penny Nom lui répond. 





Piles of coins 
20011205 

A student pose la question : Sharon has less than 20 coins. When she puts them in piles of 5, she has 1 left over. When she put them in piles of 3, she also has 1 left over. How many coins does Sharon have? Penny Nom lui répond. 





Lots of coins 
20010426 

A student pose la question : I purchase 2 million coins at 9.75 I purchase 1 milion coins at 8 what is the formula to calculate my average cost? Penny Nom lui répond. 





Coins and monomials 
20010304 

A student pose la question : Tokola has 5 coins with a total value of $1.05. He canot make change for a dollar, 5 cents, 10 cents, 25 cent, or 50 cents. What 5 coins does he have? and Determine whether 6cd is a monmial. Explain why or why not. Penny Nom lui répond. 





Rolling Circles 
19990912 

Craig Ellis pose la question : We have a circle of radius 3. inside the circle and tangent to the circle of radius 3 at one point is a circleof radius 1. The question is if we could roll the smaller circle around the inside of the larger circle how many revolutions would it take to get around to where we started. Chris Fisher and Walter Whiteley lui répond. 





48 cents with 6 coins 
19990505 

Belinda pose la question : i'm in 5th grade. my teacher asked this question: what are two ways you can make 48 cents out of 6 coins? i could only figure out one way. please help. Chris Fisher lui répond. 





A balance problem 
19961118 

Jack N. Bussell pose la question : There are 12 coins which look exactly the same, however one of them is heavier or lighter than the rest. Using a pointer balance scale, can you identify the odd coin and whether it is heavy or light in 3 weighings? Harley Weston lui répond. 





A coin problem 
19960416 

Julie Hebert and Simon Hamel pose la question : How many weighings would you need to find out which pile is fraudulent? Penny Nom lui répond. 

