In a tuckshop,
38 of the students wore ties. After 120 students who wore ties entered the tuckshop, the percentage of students who wore ties increased to 75%. How many students in the tuckshop did not wear ties?
|
Wore ties |
Did not wear ties |
Before |
3x1 = 3 u |
5x1 = 5 u |
Change |
+ 120 |
|
After |
3x5 = 15 u |
1x5 = 5 u |
75% =
75100 =
34The number of students who did not wear ties remains unchanged. LCM of 5 and 1 is 5.
Number of students who wore ties and left
= 15 u - 3 u
= 12 u
12 u = 120
1 u = 120 ÷ 12 = 10
Number of students who did not wear ties
= 5 u
= 5 x 10
= 50
Answer(s): 50