PSLE The ratio of the number of shirts to that of skirts in a shop was 5 : 2 in the end. After 18 skirts were sold, the ratio of the number of shirts to that of skirts became 4 : 1. What was the total number of shirts and skirts in the shop in the end?
|
Shirts |
Skirts |
Total |
Before |
5x4 = 20 u |
2x4 = 8 u |
28 u |
Change |
|
- 18 |
|
After |
4x5 = 20 u |
1x5 = 5 u |
25 u |
The number of shirts remains unchanged.
Make the number of shirts the same.
LCM of 2 and 5 is 20.
Number of skirts sold
= 8 u - 5 u
= 3 u
1 u = 18 ÷ 3 = 6
Total number of shirts and skirts in the end
= 20 u + 5 u
= 25 u
= 25 x 6
= 150
Answer(s): 150