In a canteen,
18 of the children wore cardigans. After 230 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 |
7x3 =
21 u |
| Change |
+ 230 |
|
| After |
7x7 =
49 u |
3x7 =
21 u |
70% =
70100 =
710The number of children who did not wear cardigans remains unchanged. LCM of 7 and 3 is 21.
Number of children who wore cardigans and left
= 49 u - 3 u
= 46 u
46 u = 230
1 u = 230 ÷ 46 = 5
Number of children who did not wear cardigans
= 21 u
= 21 x 5
= 105
Answer(s): 105
