PSLE The ratio of the number of blazers to that of skirts in a shopping centre was 4 : 1 at first. After 18 skirts were sold, the ratio of the number of blazers to that of skirts became 11 : 2. What was the total number of blazers and skirts in the shopping centre at first?
|
Blazers |
Skirts |
Total |
Before |
4x11 = 44 u |
1x11 = 11 u |
55 u |
Change |
|
- 18 |
|
After |
11x4 = 44 u |
2x4 = 8 u |
52 u |
The number of blazers remains unchanged. Make the number of blazers the same.
LCM of 11 and 4 is 44.
Number of skirts sold
= 11 u - 8 u
= 3 u
1 u = 18 ÷ 3 = 6
Total number of blazers and skirts at first
= 44 u + 11 u
= 55 u
= 55 x 6
= 330
Answer(s): 330