SOLUTION: If the pupil in a class sends a New Year greeting cards to every classmate ,the total number of cards sent out will be 870. Find the number of pupils in the class.

SOLUTION: If the pupil in a class sends a New Year greeting cards to every classmate ,the total number of cards sent out will be 870. Find the number of pupils in the class.

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Question 971960: If the pupil in a class sends a New Year greeting cards to every classmate ,the total number of cards sent out will be 870. Find the number of pupils in the class.
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
EVERY PUPIL SENDS CARDS TO (X-1) PUPILS.
X IS THE TOTAL NUMBER OF PUPILS.
X(X-1)=870
X^2-X-870=0
(X-30)(X+29)=0
X-30=0
X=30 NUMBER OF PUPILS.
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