In a basketball court,
710 of the children wore glasses. After 60 children who wore glasses left the basketball court, the percentage of children who wore glasses decreased to 10%. How many children in the basketball court did not wear glasses?
| |
Wore glasses |
Did not wear glasses |
| Before |
7x3 =
21 u |
3x3 =
9 u |
| Change |
- 60 |
|
| After |
1x1 =
1 u |
9x1 =
9 u |
10% =
10100 =
110The number of children who did not wear glasses remains unchanged. LCM of 3 and 9 is 9.
Number of children who wore glasses and left
= 21 u - 1 u
= 20 u
20 u = 60
1 u = 60 ÷ 20 = 3
Number of children who did not wear glasses
= 9 u
= 9 x 3
= 27
Answer(s): 27
