In a canteen,
56 of the boys wore caps. After 133 boys who wore caps left the canteen, the percentage of boys who wore caps decreased to 20%. How many boys in the canteen did not wear caps?
|
Wore caps |
Did not wear caps |
Before |
5x4 = 20 u |
1x4 = 4 u |
Change |
- 133 |
|
After |
1x1 = 1 u |
4x1 = 4 u |
20% =
20100 =
15The number of boys who did not wear caps remains unchanged. LCM of 1 and 4 is 4.
Number of boys who wore caps and left
= 20 u - 1 u
= 19 u
19 u = 133
1 u = 133 ÷ 19 = 7
Number of boys who did not wear caps
= 4 u
= 4 x 7
= 28
Answer(s): 28