In a canteen,
14 of the pupils wore cardigans. After 88 pupils who wore cardigans entered the canteen, the percentage of pupils who wore cardigans increased to 75%. How many pupils in the canteen did not wear cardigans?
| |
Wore cardigans |
Did not wear cardigans |
| Before |
1x1 =
1 u |
3x1 =
3 u |
| Change |
+ 88 |
|
| After |
3x3 =
9 u |
1x3 =
3 u |
75% =
75100 =
34The number of pupils who did not wear cardigans remains unchanged. LCM of 3 and 1 is 3.
Number of pupils who wore cardigans and left
= 9 u - 1 u
= 8 u
8 u = 88
1 u = 88 ÷ 8 = 11
Number of pupils who did not wear cardigans
= 3 u
= 3 x 11
= 33
Answer(s): 33
