In a tuckshop,
27 of the boys wore ties. After 36 boys who wore ties entered the tuckshop, the percentage of boys who wore ties increased to 80%. How many boys in the tuckshop did not wear ties?
| |
Wore ties |
Did not wear ties |
| Before |
2x1 =
2 u |
5x1 =
5 u |
| Change |
+ 36 |
|
| After |
4x5 =
20 u |
1x5 =
5 u |
80% =
80100 =
45The number of boys who did not wear ties remains unchanged. LCM of 5 and 1 is 5.
Number of boys who wore ties and left
= 20 u - 2 u
= 18 u
18 u = 36
1 u = 36 ÷ 18 = 2
Number of boys who did not wear ties
= 5 u
= 5 x 2
= 10
Answer(s): 10
