PSLE The ratio of the number of coats to that of dresses in a shop was 8 : 7 in the end. After 63 dresses were sold, the ratio of the number of coats to that of dresses became 7 : 5. What was the total number of coats and dresses in the shop in the end?
|
Coats |
Dresses |
Total |
Before |
8x7 = 56 u |
7x7 = 49 u |
105 u |
Change |
|
- 63 |
|
After |
7x8 = 56 u |
5x8 = 40 u |
96 u |
The number of coats remains unchanged.
Make the number of coats the same.
LCM of 7 and 8 is 56.
Number of dresses sold
= 49 u - 40 u
= 9 u
1 u = 63 ÷ 9 = 7
Total number of coats and dresses in the end
= 56 u + 40 u
= 96 u
= 96 x 7
= 672
Answer(s): 672