PSLE The ratio of the number of sweaters to that of jumpsuits in a boutique was 5 : 4 in the end. After 18 jumpsuits were sold, the ratio of the number of sweaters to that of jumpsuits became 2 : 1. What was the total number of sweaters and jumpsuits in the boutique in the end?
|
Sweaters |
Jumpsuits |
Total |
Before |
5x2 = 10 u |
4x2 = 8 u |
18 u |
Change |
|
- 18 |
|
After |
2x5 = 10 u |
1x5 = 5 u |
15 u |
The number of sweaters remains unchanged.
Make the number of sweaters the same.
LCM of 4 and 5 is 10.
Number of jumpsuits sold
= 8 u - 5 u
= 3 u
1 u = 18 ÷ 3 = 6
Total number of sweaters and jumpsuits in the end
= 10 u + 5 u
= 15 u
= 15 x 6
= 90
Answer(s): 90