In a hall,
15 of the children wore caps. After 150 children who wore caps entered the hall, the percentage of children who wore caps increased to 70%. How many children in the hall did not wear caps?
|
Wore caps |
Did not wear caps |
Before |
1x3 = 3 u |
4x3 = 12 u |
Change |
+ 150 |
|
After |
7x4 = 28 u |
3x4 = 12 u |
70% =
70100 =
710The number of children who did not wear caps remains unchanged. LCM of 4 and 3 is 12.
Number of children who wore caps and left
= 28 u - 3 u
= 25 u
25 u = 150
1 u = 150 ÷ 25 = 6
Number of children who did not wear caps
= 12 u
= 12 x 6
= 72
Answer(s): 72