In a tuckshop,
15 of the boys wore caps. After 121 boys who wore caps entered the tuckshop, the percentage of boys who wore caps increased to 75%. How many boys in the tuckshop did not wear caps?
|
Wore caps |
Did not wear caps |
Before |
1x1 = 1 u |
4x1 = 4 u |
Change |
+ 121 |
|
After |
3x4 = 12 u |
1x4 = 4 u |
75% =
75100 =
34The number of boys who did not wear caps remains unchanged. LCM of 4 and 1 is 4.
Number of boys who wore caps and left
= 12 u - 1 u
= 11 u
11 u = 121
1 u = 121 ÷ 11 = 11
Number of boys who did not wear caps
= 4 u
= 4 x 11
= 44
Answer(s): 44