PSLE The ratio of the number of shirts to that of coats in a boutique was 5 : 4 in the end. After 66 coats were sold, the ratio of the number of shirts to that of coats became 9 : 5. What was the total number of shirts and coats in the boutique in the end?
|
Shirts |
Coats |
Total |
Before |
5x9 = 45 u |
4x9 = 36 u |
81 u |
Change |
|
- 66 |
|
After |
9x5 = 45 u |
5x5 = 25 u |
70 u |
The number of shirts remains unchanged.
Make the number of shirts the same.
LCM of 4 and 5 is 45.
Number of coats sold
= 36 u - 25 u
= 11 u
1 u = 66 ÷ 11 = 6
Total number of shirts and coats in the end
= 45 u + 25 u
= 70 u
= 70 x 6
= 420
Answer(s): 420