Mary had an equal number of oranges and mandarin oranges at first. She sold two-thirds of the mandarin oranges and bought another 30 oranges. In the end, she had five times as many oranges as mandarin oranges. Find the number of mandarin oranges she had at first.
| |
Mandarin Oranges |
Oranges |
| Before |
3 u |
5 u - 30 |
| Change |
- 2 u |
+ 30 |
| After |
1 u |
5 u |
The number of oranges and mandarin oranges at first is the same.
5 u - 30 = 3 u
5 u - 3 u = 30
2 u = 30
1 u = 30 ÷ 2 = 15
Number of mandarin oranges that she had at first
= 3 u
= 3 x 15
= 45
Answer(s): 45
