PSLE The ratio of the number of blouses to that of coats in a boutique was 3 : 1 at first. After 10 coats were sold, the ratio of the number of blouses to that of coats became 5 : 1. What was the total number of blouses and coats in the boutique at first?
|
Blouses |
Coats |
Total |
Before |
3x5 = 15 u |
1x5 = 5 u |
20 u |
Change |
|
- 10 |
|
After |
5x3 = 15 u |
1x3 = 3 u |
18 u |
The number of blouses remains unchanged. Make the number of blouses the same.
LCM of 5 and 3 is 15.
Number of coats sold
= 5 u - 3 u
= 2 u
1 u = 10 ÷ 2 = 5
Total number of blouses and coats at first
= 15 u + 5 u
= 20 u
= 20 x 5
= 100
Answer(s): 100