Irene had an equal number of tomatoes and plums at first. She sold one-quarter of the plums and bought another 30 tomatoes. In the end, she had twice as many tomatoes as plums. Find the number of plums she had at first.
| |
Plums |
Tomatoes |
| Before |
4 u |
6 u - 30 |
| Change |
- 1 u |
+ 30 |
| After |
3 u |
6 u |
The number of tomatoes and plums at first is the same.
6 u - 30 = 4 u
6 u - 4 u = 30
2 u = 30
1 u = 30 ÷ 2 = 15
Number of plums that she had at first
= 4 u
= 4 x 15
= 60
Answer(s): 60
