|
Un article trouvé pour ce sujet.
 |
|
|
|
|
|
|
|
|
Derfs, Enajs and Sivads |
2001-01-07 |
|
John and Norman pose la question :
All Derfs are Enajs. One-third of all Enajs are Derfs. Half of all Sivads are Enajs. One Sivad is a Derf. Eight Sivads are Enajs. The number of Enajs is 90. How many Enajs are neither Derf nor Sivad?
Penny Nom lui répond. |
|
|
|
