In a basketball court,
17 of the pupils wore ties. After 40 pupils who wore ties entered the basketball court, the percentage of pupils who wore ties increased to 60%. How many pupils in the basketball court did not wear ties?
|
Wore ties |
Did not wear ties |
Before |
1x1 = 1 u |
6x1 = 6 u |
Change |
+ 40 |
|
After |
3x3 = 9 u |
2x3 = 6 u |
60% =
60100 =
35The number of pupils who did not wear ties remains unchanged. LCM of 6 and 2 is 6.
Number of pupils who wore ties and left
= 9 u - 1 u
= 8 u
8 u = 40
1 u = 40 ÷ 8 = 5
Number of pupils who did not wear ties
= 6 u
= 6 x 5
= 30
Answer(s): 30