PSLE The ratio of the number of skirts to that of sweaters in a shop was 9 : 4 in the end. After 65 sweaters were sold, the ratio of the number of skirts to that of sweaters became 10 : 3. What was the total number of skirts and sweaters in the shop in the end?
|
Skirts |
Sweaters |
Total |
Before |
9x10 = 90 u |
4x10 = 40 u |
130 u |
Change |
|
- 65 |
|
After |
10x9 = 90 u |
3x9 = 27 u |
117 u |
The number of skirts remains unchanged. Make the number of skirts the same.
LCM of 10 and 9 is 90.
Number of sweaters sold
= 40 u - 27 u
= 13 u
1 u = 65 ÷ 13 = 5
Total number of skirts and sweaters in the end
= 90 u + 27 u
= 117 u
= 117 x 5
= 585
Answer(s): 585