PSLE The ratio of the number of vests to that of skirts in a boutique was 5 : 2 at first. After 63 skirts were sold, the ratio of the number of vests to that of skirts became 7 : 1. What was the total number of vests and skirts in the boutique at first?
|
Vests |
Skirts |
Total |
Before |
5x7 = 35 u |
2x7 = 14 u |
49 u |
Change |
|
- 63 |
|
After |
7x5 = 35 u |
1x5 = 5 u |
40 u |
The number of vests remains unchanged.
Make the number of vests the same.
LCM of 2 and 5 is 35.
Number of skirts sold
= 14 u - 5 u
= 9 u
1 u = 63 ÷ 9 = 7
Total number of vests and skirts at first
= 35 u + 14 u
= 49 u
= 49 x 7
= 343
Answer(s): 343