In a tuckshop,
14 of the boys wore glasses. After 24 boys who wore glasses left the tuckshop, the percentage of boys who wore glasses decreased to 10%. How many boys in the tuckshop did not wear glasses?
| |
Wore glasses |
Did not wear glasses |
| Before |
1x3 =
3 u |
3x3 =
9 u |
| Change |
- 24 |
|
| After |
1x1 =
1 u |
9x1 =
9 u |
10% =
10100 =
110The number of boys who did not wear glasses remains unchanged. LCM of 3 and 9 is 9.
Number of boys who wore glasses and left
= 3 u - 1 u
= 2 u
2 u = 24
1 u = 24 ÷ 2 = 12
Number of boys who did not wear glasses
= 9 u
= 9 x 12
= 108
Answer(s): 108
