PSLE The ratio of the number of jumpsuits to that of coats in a boutique was 4 : 3 in the end. After 21 coats were sold, the ratio of the number of jumpsuits to that of coats became 5 : 2. What was the total number of jumpsuits and coats in the boutique in the end?
|
Jumpsuits |
Coats |
Total |
Before |
4x5 = 20 u |
3x5 = 15 u |
35 u |
Change |
|
- 21 |
|
After |
5x4 = 20 u |
2x4 = 8 u |
28 u |
The number of jumpsuits remains unchanged. Make the number of jumpsuits the same.
LCM of 5 and 4 is 20.
Number of coats sold
= 15 u - 8 u
= 7 u
1 u = 21 ÷ 7 = 3
Total number of jumpsuits and coats in the end
= 20 u + 8 u
= 28 u
= 28 x 3
= 84
Answer(s): 84