In a tuckshop,
110 of the boys wore scarves. After 105 boys who wore scarves entered the tuckshop, the percentage of boys who wore scarves increased to 80%. How many boys in the tuckshop did not wear scarves?
| |
Wore scarves |
Did not wear scarves |
| Before |
1x1 =
1 u |
9x1 =
9 u |
| Change |
+ 105 |
|
| After |
4x9 =
36 u |
1x9 =
9 u |
80% =
80100 =
45The number of boys who did not wear scarves remains unchanged. LCM of 9 and 1 is 9.
Number of boys who wore scarves and left
= 36 u - 1 u
= 35 u
35 u = 105
1 u = 105 ÷ 35 = 3
Number of boys who did not wear scarves
= 9 u
= 9 x 3
= 27
Answer(s): 27
