In a hall,
18 of the boys wore caps. After 209 boys who wore caps entered the hall, the percentage of boys who wore caps increased to 60%. How many boys in the hall did not wear caps?
|
Wore caps |
Did not wear caps |
Before |
1x2 = 2 u |
7x2 = 14 u |
Change |
+ 209 |
|
After |
3x7 = 21 u |
2x7 = 14 u |
60% =
60100 =
35The number of boys who did not wear caps remains unchanged. LCM of 7 and 2 is 14.
Number of boys who wore caps and left
= 21 u - 2 u
= 19 u
19 u = 209
1 u = 209 ÷ 19 = 11
Number of boys who did not wear caps
= 14 u
= 14 x 11
= 154
Answer(s): 154