In a hall,
37 of the children wore caps. After 396 children who wore caps entered the hall, the percentage of children who wore caps increased to 90%. How many children in the hall did not wear caps?
|
Wore caps |
Did not wear caps |
Before |
3x1 = 3 u |
4x1 = 4 u |
Change |
+ 396 |
|
After |
9x4 = 36 u |
1x4 = 4 u |
90% =
90100 =
910The number of children who did not wear caps remains unchanged. LCM of 4 and 1 is 4.
Number of children who wore caps and left
= 36 u - 3 u
= 33 u
33 u = 396
1 u = 396 ÷ 33 = 12
Number of children who did not wear caps
= 4 u
= 4 x 12
= 48
Answer(s): 48