PSLE The ratio of the number of shirts to that of dresses in a shopping centre was 5 : 4 in the end. After 92 dresses were sold, the ratio of the number of shirts to that of dresses became 7 : 1. What was the total number of shirts and dresses in the shopping centre in the end?
|
Shirts |
Dresses |
Total |
Before |
5x7 = 35 u |
4x7 = 28 u |
63 u |
Change |
|
- 92 |
|
After |
7x5 = 35 u |
1x5 = 5 u |
40 u |
The number of shirts remains unchanged. Make the number of shirts the same.
LCM of 7 and 5 is 35.
Number of dresses sold
= 28 u - 5 u
= 23 u
1 u = 92 ÷ 23 = 4
Total number of shirts and dresses in the end
= 35 u + 5 u
= 40 u
= 40 x 4
= 160
Answer(s): 160