In a parade square,
59 of the children wore glasses. After 93 children who wore glasses entered the parade square, the percentage of children who wore glasses increased to 90%. How many children in the parade square did not wear glasses?
| |
Wore glasses |
Did not wear glasses |
| Before |
5x1 =
5 u |
4x1 =
4 u |
| Change |
+ 93 |
|
| After |
9x4 =
36 u |
1x4 =
4 u |
90% =
90100 =
910The number of children who did not wear glasses remains unchanged. LCM of 4 and 1 is 4.
Number of children who wore glasses and left
= 36 u - 5 u
= 31 u
31 u = 93
1 u = 93 ÷ 31 = 3
Number of children who did not wear glasses
= 4 u
= 4 x 3
= 12
Answer(s): 12
