PSLE The ratio of the number of dresses to that of sweaters in a shopping centre was 7 : 2 at first. After 35 sweaters were sold, the ratio of the number of dresses to that of sweaters became 6 : 1. What was the total number of dresses and sweaters in the shopping centre at first?
|
Dresses |
Sweaters |
Total |
Before |
7x6 = 42 u |
2x6 = 12 u |
54 u |
Change |
|
- 35 |
|
After |
6x7 = 42 u |
1x7 = 7 u |
49 u |
The number of dresses remains unchanged. Make the number of dresses the same.
LCM of 6 and 7 is 42.
Number of sweaters sold
= 12 u - 7 u
= 5 u
1 u = 35 ÷ 5 = 7
Total number of dresses and sweaters at first
= 42 u + 12 u
= 54 u
= 54 x 7
= 378
Answer(s): 378