In a parade square,
12 of the children wore glasses. After 64 children who wore glasses left the parade square, the percentage of children who wore glasses decreased to 10%. How many children in the parade square did not wear glasses?
| |
Wore glasses |
Did not wear glasses |
| Before |
1x9 =
9 u |
1x9 =
9 u |
| Change |
- 64 |
|
| After |
1x1 =
1 u |
9x1 =
9 u |
10% =
10100 =
110The number of children who did not wear glasses remains unchanged. LCM of 1 and 9 is 9.
Number of children who wore glasses and left
= 9 u - 1 u
= 8 u
8 u = 64
1 u = 64 ÷ 8 = 8
Number of children who did not wear glasses
= 9 u
= 9 x 8
= 72
Answer(s): 72
