Emma had an equal number of starfruits and mangoes at first. She sold one-third of the mangoes and bought another 18 starfruits. In the end, she had thrice as many starfruits as mangoes. Find the number of mangoes she had at first.
| |
Starfruits |
Mangoes |
| Before |
6 u - 18 |
3 u |
| Change |
+ 18 |
- 1 u |
| After |
6 u |
2 u |
The number of starfruits and mangoes at first is the same.
6 u - 18 = 3 u
6 u - 3 u = 18
3 u = 18
1 u = 18 ÷ 3 = 6
Number of mangoes that Emma had at first
= 3 u
= 3 x 6
= 18
Answer(s): 18
