A store owner has 40 less lemons than persimmons. After he sold 75% of the lemons and 10% of the persimmons, he is left with 120 less lemons than persimmons. What fraction of the fruits left were lemons?

	Lemons		Persimmons
Comparing lemons and persimmons at first			40 less
Before	4x5 = 20 u	+ 40	10x2 = 20 u
Change	- 3x5 = - 15 u	- 30	- 1x2 = - 2 u
After	1x5 = 5 u	+ 10	9x2 = 18 u
Comparing lemons  and persimmons in the end	120 less

75% = ⁷⁵₁₀₀ = ³₄ 
75% x 40 = ³₄ x 40 = 30
40 - 30 = 10

10% = ¹⁰₁₀₀ = ¹₁₀ 

The number of lemons is 120 less than the number of persimmons in the end. So, if another 120 lemons are added, the number of lemons and persimmons in the end will be the same.

5 u + 10 + 120 = 18 u
5 u + 130 = 18 u
18 u - 5 u = 130
13 u = 130

1 u = 130 ÷ 13 = 10

Number of lemons left
= 5 u + 10
= 5 x 10 + 10
= 50 + 10
= 60

Total number of fruits left
= 5 u + 10 + 18 u
= 23 u + 10
= 23 x 10 + 10
= 230 + 10
= 240

^{Lemons left}_{Total fruits left} = ⁶⁰₂₄₀ = ¹₄

Answer(s): ¹₄