There were 300 lemons and persimmons in a fruit stall.
310 of the lemons and
35 of persimmons were sold. Given that there were 162 lemons and persimmons left, how many lemons were there in the fruit stall at first?
|
Lemons |
Persimmons |
Before |
10 u |
5 p |
Change |
- 3 u |
- 3 p |
After |
7 u |
2 p |
10 u + 5 p = 300 --- (1)
7 u + 2 p = 162 --- (2)
Make p the same.
(1)
x 2 20 u + 10 p = 600 --- (3)
(2)
x 5 35 u + 10 p = 810 --- (4)
(4) - (3)
35 u - 20 u = 810 - 600
15 u = 210
1 u = 210 ÷ 15 = 14
Number of lemons at first
= 10 u
= 10 x 14
= 140
Answer(s): 140