PSLE The ratio of the number of dresses to that of blouses in a boutique was 9 : 7 at first. After 25 blouses were sold, the ratio of the number of dresses to that of blouses became 2 : 1. What was the total number of dresses and blouses in the boutique at first?
|
Dresses |
Blouses |
Total |
Before |
9x2 = 18 u |
7x2 = 14 u |
32 u |
Change |
|
- 25 |
|
After |
2x9 = 18 u |
1x9 = 9 u |
27 u |
The number of dresses remains unchanged. Make the number of dresses the same.
LCM of 2 and 9 is 18.
Number of blouses sold
= 14 u - 9 u
= 5 u
1 u = 25 ÷ 5 = 5
Total number of dresses and blouses at first
= 18 u + 14 u
= 32 u
= 32 x 5
= 160
Answer(s): 160