PSLE The ratio of the number of dresses to that of jackets in a shopping centre was 11 : 6 at first. After 78 jackets were sold, the ratio of the number of dresses to that of jackets became 4 : 1. What was the total number of dresses and jackets in the shopping centre at first?
|
Dresses |
Jackets |
Total |
Before |
11x4 = 44 u |
6x4 = 24 u |
68 u |
Change |
|
- 78 |
|
After |
4x11 = 44 u |
1x11 = 11 u |
55 u |
The number of dresses remains unchanged. Make the number of dresses the same.
LCM of 4 and 11 is 44.
Number of jackets sold
= 24 u - 11 u
= 13 u
1 u = 78 ÷ 13 = 6
Total number of dresses and jackets at first
= 44 u + 24 u
= 68 u
= 68 x 6
= 408
Answer(s): 408