PSLE The ratio of the number of coats to that of skirts in a shop was 3 : 2 in the end. After 80 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 shop in the end?
|
Coats |
Skirts |
Total |
Before |
3x11 = 33 u |
2x11 = 22 u |
55 u |
Change |
|
- 80 |
|
After |
11x3 = 33 u |
2x3 = 6 u |
39 u |
The number of coats remains unchanged.
Make the number of coats the same.
LCM of 2 and 3 is 33.
Number of skirts sold
= 22 u - 6 u
= 16 u
1 u = 80 ÷ 16 = 5
Total number of coats and skirts in the end
= 33 u + 6 u
= 39 u
= 39 x 5
= 195
Answer(s): 195