In a basketball court,
49 of the boys wore cardigans. After 207 boys who wore cardigans entered the basketball court, the percentage of boys who wore cardigans increased to 70%. How many boys in the basketball court did not wear cardigans?
|
Wore cardigans |
Did not wear cardigans |
Before |
4x3 = 12 u |
5x3 = 15 u |
Change |
+ 207 |
|
After |
7x5 = 35 u |
3x5 = 15 u |
70% =
70100 =
710The number of boys who did not wear cardigans remains unchanged. LCM of 5 and 3 is 15.
Number of boys who wore cardigans and left
= 35 u - 12 u
= 23 u
23 u = 207
1 u = 207 ÷ 23 = 9
Number of boys who did not wear cardigans
= 15 u
= 15 x 9
= 135
Answer(s): 135