Problema Solution
Paul bought one ball for each boy and one top for each girl in his class. He paid $311 to buy these items for the 20 children. The price of a ball is $15 and a top costs $16.How many boys and how many girls are in his class?
Answer provided by our tutors
Let the number of boys be x
Number of girls will be 20 - x (because total is 20 and boys are x)
Total number of balls will be equal to total number of boys. Total price of balls=
Total number of balls * price of each ball
x * 15
Total number of top will be equal to total number of girls. total price of top=
Total number of tops * price of each top
(20 - x) * 16
Hence total price= 15*x + (20-x) * 16 = 311
15x + 320 - 16x = 311
-x + 320 = 311
x=9
Hence number of boys = x = 9 <-- Answer
Number of girls = 20 -x = 20-9 = 11<-- Answer