Question 1.

The number of apples and mangoes are in the ratio 5 : 2.

Let us write the number of apples as 5X and number of mangoes as 2X

This means oranges will be 187-7X. 

After selling the remaining fruits, 

Apples: 5X-75

Mangoes: 2X-26

Oranges: (187-7X)/2

Unsold Apples to Unsold oranges is 3:2

$\frac{2\left(5x-75\right)}{187-7x}=\frac{3}{2}$

$20x-300=561-21x$

$41x=861$

$x=21$

Total number of unsold fruits will be, 

Apples: 30

Mangoes: 16

Oranges: 20

Total is 66.