PSLE The ratio of the number of sweaters to that of jumpsuits in a shopping centre was 7 : 3 at first. After 22 jumpsuits were sold, the ratio of the number of sweaters to that of jumpsuits became 6 : 1. What was the total number of sweaters and jumpsuits in the shopping centre at first?
|
Sweaters |
Jumpsuits |
Total |
Before |
7x6 = 42 u |
3x6 = 18 u |
60 u |
Change |
|
- 22 |
|
After |
6x7 = 42 u |
1x7 = 7 u |
49 u |
The number of sweaters remains unchanged. Make the number of sweaters the same.
LCM of 6 and 7 is 42.
Number of jumpsuits sold
= 18 u - 7 u
= 11 u
1 u = 22 ÷ 11 = 2
Total number of sweaters and jumpsuits at first
= 42 u + 18 u
= 60 u
= 60 x 2
= 120
Answer(s): 120