In a parade square,
23 of the pupils wore ties. After 56 pupils who wore ties left the parade square, the percentage of pupils who wore ties decreased to 20%. How many pupils in the parade square did not wear ties?
|
Wore ties |
Did not wear ties |
Before |
2x4 = 8 u |
1x4 = 4 u |
Change |
- 56 |
|
After |
1x1 = 1 u |
4x1 = 4 u |
20% =
20100 =
15The number of pupils who did not wear ties remains unchanged. LCM of 1 and 4 is 4.
Number of pupils who wore ties and left
= 8 u - 1 u
= 7 u
7 u = 56
1 u = 56 ÷ 7 = 8
Number of pupils who did not wear ties
= 4 u
= 4 x 8
= 32
Answer(s): 32