In a canteen,
13 of the children wore cardigans. After 55 children who wore cardigans entered the canteen, the percentage of children who wore cardigans increased to 70%. How many children in the canteen did not wear cardigans?
| |
Wore cardigans |
Did not wear cardigans |
| Before |
1x3 =
3 u |
2x3 =
6 u |
| Change |
+ 55 |
|
| After |
7x2 =
14 u |
3x2 =
6 u |
70% =
70100 =
710The number of children who did not wear cardigans remains unchanged. LCM of 2 and 3 is 6.
Number of children who wore cardigans and left
= 14 u - 3 u
= 11 u
11 u = 55
1 u = 55 ÷ 11 = 5
Number of children who did not wear cardigans
= 6 u
= 6 x 5
= 30
Answer(s): 30
