24 children in a class sold an average of 20 beads for charity. There were 8 more girls than boys in the class. The average number of beads sold by the girls was 17. Find the average number of beads sold by the boys.
| |
Boys |
Girls |
Total |
| Number |
1 u |
1 u + 8 |
24 |
| Value |
? |
17 |
20 |
| Total value |
208 |
272 |
480 |
Total number of beads sold
= 24 x 20
= 480
Number of boys = 1 u
Number of girls = 1 u + 8
1 u + 1 u + 8 = 24
2 u + 8 = 24
2 u = 24 - 8
2 u = 16
1 u = 16 ÷ 2 = 8
Number of girls in class
= 1 u + 8
= 8 + 8
= 16
Number of beads sold by girls
= 16 x 17
= 272
Number of beads sold by boys
= 480 - 272
= 208
Average number of beads sold by boys
= 208 ÷ 8
= 26
Answer(s): 26
