In a parade square,
89 of the pupils wore cardigans. After 39 pupils who wore cardigans left the parade square, the percentage of pupils who wore cardigans decreased to 60%. How many pupils in the parade square did not wear cardigans?
| |
Wore cardigans |
Did not wear cardigans |
| Before |
8x2 =
16 u |
1x2 =
2 u |
| Change |
- 39 |
|
| After |
3x1 =
3 u |
2x1 =
2 u |
60% =
60100 =
35The number of pupils who did not wear cardigans remains unchanged. LCM of 1 and 2 is 2.
Number of pupils who wore cardigans and left
= 16 u - 3 u
= 13 u
13 u = 39
1 u = 39 ÷ 13 = 3
Number of pupils who did not wear cardigans
= 2 u
= 2 x 3
= 6
Answer(s): 6
