PSLE The ratio of the number of coats to that of skirts in a shopping centre was 5 : 2 at first. After 96 skirts were sold, the ratio of the number of coats to that of skirts became 11 : 2. What was the total number of coats and skirts in the shopping centre at first?
|
Coats |
Skirts |
Total |
Before |
5x11 = 55 u |
2x11 = 22 u |
77 u |
Change |
|
- 96 |
|
After |
11x5 = 55 u |
2x5 = 10 u |
65 u |
The number of coats remains unchanged. Make the number of coats the same.
LCM of 11 and 5 is 55.
Number of skirts sold
= 22 u - 10 u
= 12 u
1 u = 96 ÷ 12 = 8
Total number of coats and skirts at first
= 55 u + 22 u
= 77 u
= 77 x 8
= 616
Answer(s): 616