In a tuckshop,
67 of the boys wore scarves. After 72 boys who wore scarves left the tuckshop, the percentage of boys who wore scarves decreased to 60%. How many boys in the tuckshop did not wear scarves?
| |
Wore scarves |
Did not wear scarves |
| Before |
6x2 =
12 u |
1x2 =
2 u |
| Change |
- 72 |
|
| After |
3x1 =
3 u |
2x1 =
2 u |
60% =
60100 =
35The number of boys who did not wear scarves remains unchanged. LCM of 1 and 2 is 2.
Number of boys who wore scarves and left
= 12 u - 3 u
= 9 u
9 u = 72
1 u = 72 ÷ 9 = 8
Number of boys who did not wear scarves
= 2 u
= 2 x 8
= 16
Answer(s): 16
