In a canteen,
23 of the children wore vests. After 28 children who wore vests left the canteen, the percentage of children who wore vests decreased to 20%. How many children in the canteen did not wear vests?
| |
Wore vests |
Did not wear vests |
| Before |
2x4 =
8 u |
1x4 =
4 u |
| Change |
- 28 |
|
| After |
1x1 =
1 u |
4x1 =
4 u |
20% =
20100 =
15The number of children who did not wear vests remains unchanged. LCM of 1 and 4 is 4.
Number of children who wore vests and left
= 8 u - 1 u
= 7 u
7 u = 28
1 u = 28 ÷ 7 = 4
Number of children who did not wear vests
= 4 u
= 4 x 4
= 16
Answer(s): 16
