Erika had an equal number of mandarin oranges and apples at first. She sold half of the apples and bought another 80 mandarin oranges. In the end, she had four times as many mandarin oranges as apples. Find the number of apples she had at first.
| |
Apples |
Mandarin Oranges |
| Before |
2 u |
4 u - 80 |
| Change |
- 1 u |
+ 80 |
| After |
1 u |
4 u |
The number of mandarin oranges and apples at first is the same.
4 u - 80 = 2 u
4 u - 2 u = 80
2 u = 80
1 u = 80 ÷ 2 = 40
Number of apples that she had at first
= 2 u
= 2 x 40
= 80
Answer(s): 80
