Winnie had an equal number of grapefruits and mangosteens at first. She sold half of the mangosteens and bought another 18 grapefruits. In the end, she had four times as many grapefruits as mangosteens. Find the number of mangosteens she had at first.
| |
Grapefruits |
Mangosteens |
| Before |
4 u - 18 |
2 u |
| Change |
+ 18 |
- 1 u |
| After |
4 u |
1 u |
The number of grapefruits and mangosteens at first is the same.
4 u - 18 = 2 u
4 u - 2 u = 18
2 u = 18
1 u = 18 ÷ 2 = 9
Number of mangosteens that Winnie had at first
= 2 u
= 2 x 9
= 18
Answer(s): 18
