In a tuckshop,
57 of the children wore ties. After 129 children who wore ties left the tuckshop, the percentage of children who wore ties decreased to 10%. How many children in the tuckshop did not wear ties?
| |
Wore ties |
Did not wear ties |
| Before |
5x9 =
45 u |
2x9 =
18 u |
| Change |
- 129 |
|
| After |
1x2 =
2 u |
9x2 =
18 u |
10% =
10100 =
110The number of children who did not wear ties remains unchanged. LCM of 2 and 9 is 18.
Number of children who wore ties and left
= 45 u - 2 u
= 43 u
43 u = 129
1 u = 129 ÷ 43 = 3
Number of children who did not wear ties
= 18 u
= 18 x 3
= 54
Answer(s): 54
