In a canteen,
37 of the children wore vests. After 27 children who wore vests entered the canteen, the percentage of children who wore vests increased to 75%. How many children in the canteen did not wear vests?
| |
Wore vests |
Did not wear vests |
| Before |
3x1 =
3 u |
4x1 =
4 u |
| Change |
+ 27 |
|
| After |
3x4 =
12 u |
1x4 =
4 u |
75% =
75100 =
34The number of children who did not wear vests remains unchanged. LCM of 4 and 1 is 4.
Number of children who wore vests and left
= 12 u - 3 u
= 9 u
9 u = 27
1 u = 27 ÷ 9 = 3
Number of children who did not wear vests
= 4 u
= 4 x 3
= 12
Answer(s): 12
