In a canteen,
35 of the boys wore caps. After 165 boys who wore caps entered the canteen, the percentage of boys who wore caps increased to 90%. How many boys in the canteen did not wear caps?
|
Wore caps |
Did not wear caps |
Before |
3x1 = 3 u |
2x1 = 2 u |
Change |
+ 165 |
|
After |
9x2 = 18 u |
1x2 = 2 u |
90% =
90100 =
910The number of boys who did not wear caps remains unchanged. LCM of 2 and 1 is 2.
Number of boys who wore caps and left
= 18 u - 3 u
= 15 u
15 u = 165
1 u = 165 ÷ 15 = 11
Number of boys who did not wear caps
= 2 u
= 2 x 11
= 22
Answer(s): 22