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