Fiona had an equal number of oranges and guavas at first. She sold one-third of the guavas and bought another 78 oranges. In the end, she had thrice as many oranges as guavas. Find the number of guavas she had at first.
| |
Guavas |
Oranges |
| Before |
3 u |
6 u - 78 |
| Change |
- 1 u |
+ 78 |
| After |
2 u |
6 u |
The number of oranges and guavas at first is the same.
6 u - 78 = 3 u
6 u - 3 u = 78
3 u = 78
1 u = 78 ÷ 3 = 26
Number of guavas that she had at first
= 3 u
= 3 x 26
= 78
Answer(s): 78
