In a tuckshop,
37 of the children wore spectacles. After 15 children who wore spectacles left the tuckshop, the percentage of children who wore spectacles decreased to 25%. How many children in the tuckshop did not wear spectacles?
| |
Wore spectacles |
Did not wear spectacles |
| Before |
3x3 =
9 u |
4x3 =
12 u |
| Change |
- 15 |
|
| After |
1x4 =
4 u |
3x4 =
12 u |
25% =
25100 =
14The number of children who did not wear spectacles remains unchanged. LCM of 4 and 3 is 12.
Number of children who wore spectacles and left
= 9 u - 4 u
= 5 u
5 u = 15
1 u = 15 ÷ 5 = 3
Number of children who did not wear spectacles
= 12 u
= 12 x 3
= 36
Answer(s): 36
