20 students in a class sold an average of 14 cartoon figurines for charity. There were 4 more girls than boys in the class. The average number of cartoon figurines sold by the girls was 12. Find the average number of cartoon figurines sold by the boys.
| |
Boys |
Girls |
Total |
| Number |
1 u |
1 u + 4 |
20 |
| Value |
? |
12 |
14 |
| Total value |
136 |
144 |
280 |
Total number of cartoon figurines sold
= 20 x 14
= 280
Number of boys = 1 u
Number of girls = 1 u + 4
1 u + 1 u + 4 = 20
2 u + 4 = 20
2 u = 20 - 4
2 u = 16
1 u = 16 ÷ 2 = 8
Number of girls in class
= 1 u + 4
= 8 + 4
= 12
Number of cartoon figurines sold by girls
= 12 x 12
= 144
Number of cartoon figurines sold by boys
= 280 - 144
= 136
Average number of cartoon figurines sold by boys
= 136 ÷ 8
= 17
Answer(s): 17
