27 pupils in a class sold an average of 22 cartoon figurines for charity. There were 9 more boys than girls in the class. The average number of cartoon figurines sold by the boys was 16. Find the average number of cartoon figurines sold by the girls.
| |
Girls |
Boys |
Total |
| Number |
1 u |
1 u + 9 |
27 |
| Value |
? |
16 |
22 |
| Total value |
306 |
288 |
594 |
Total number of cartoon figurines sold
= 27 x 22
= 594
Number of girls = 1 u
Number of boys = 1 u + 9
1 u + 1 u + 9 = 27
2 u + 9 = 27
2 u = 27 - 9
2 u = 18
1 u = 18 ÷ 2 = 9
Number of boys in class
= 1 u + 9
= 9 + 9
= 18
Number of cartoon figurines sold by boys
= 18 x 16
= 288
Number of cartoon figurines sold by girls
= 594 - 288
= 306
Average number of cartoon figurines sold by girls
= 306 ÷ 9
= 34
Answer(s): 34
