In a school field,
49 of the children wore cardigans. After 77 children who wore cardigans entered the school field, the percentage of children who wore cardigans increased to 75%. How many children in the school field did not wear cardigans?
| |
Wore cardigans |
Did not wear cardigans |
| Before |
4x1 =
4 u |
5x1 =
5 u |
| Change |
+ 77 |
|
| After |
3x5 =
15 u |
1x5 =
5 u |
75% =
75100 =
34The number of children who did not wear cardigans remains unchanged. LCM of 5 and 1 is 5.
Number of children who wore cardigans and left
= 15 u - 4 u
= 11 u
11 u = 77
1 u = 77 ÷ 11 = 7
Number of children who did not wear cardigans
= 5 u
= 5 x 7
= 35
Answer(s): 35
