A store owner has 25 less starfruits than mangoes. After he sold 60% of the starfruits and 10% of the mangoes, he is left with 50 less starfruits than mangoes. What fraction of the fruits left were starfruits?

	Starfruits		Mangoes
Comparing starfruits and mangoes at first			25 less
Before	5x2 = 10 u	+ 25	10x1 = 10 u
Change	- 3x2 = - 6 u	- 15	- 1x1 = - 1 u
After	2x2 = 4 u	+ 10	9x1 = 9 u
Comparing starfruits  and mangoes in the end	50 less

60% = ⁶⁰₁₀₀ = ³₅ 
60% x 25 = ³₅ x 25 = 15
25 - 15 = 10

10% = ¹⁰₁₀₀ = ¹₁₀ 

The number of starfruits is 50 less than the number of mangoes in the end. So, if another 50 starfruits are added, the number of starfruits and mangoes in the end will be the same.

4 u + 10 + 50 = 9 u
4 u + 60 = 9 u
9 u - 4 u = 60
5 u = 60

1 u = 60 ÷ 5 = 12

Number of starfruits left
= 4 u + 10
= 4 x 12 + 10
= 48 + 10
= 58

Total number of fruits left
= 4 u + 10 + 9 u
= 13 u + 10
= 13 x 12 + 10
= 156 + 10
= 166

^{Starfruits left}_{Total fruits left} = ⁵⁸₁₆₆ = ²⁹₈₃

Answer(s): ²⁹₈₃