Method 1 :

At first —

apples : oranges

2 : 5

24u : 60u

24u – (3/4) x 24u = 6u

In the end —

apples : oranges

3 : 5

6u : 10u

60u – 75 ——- 10u

1u ——- 75/(60 – 10) = 1.5

60u – 24u = 36u ——- 36 x 1.5 = 54

Method 2 :

At first —

apples : oranges

2 : 5

4u : 10u

In the end —

apples : 

4u – 3u = 1u ——- 3p

5u ——- 15p

oranges :

10u – 75 ——- 5p 

30u – 225 ——- 15p

30u – 225 ——- 5u

1u ——- 225/(30 – 5) = 9

10u – 4u = 6u ——- 6 x 9 = 54

Ans : 54.

Thanks. Ur explanation very clear

You are most welcome.

1u = 3p

10u – 75 = 5p

10(3p) – 75 = 5p

30p – 75 = 5p

25p = 75

p = 3

1u = 3p = 9

Difference at first -> 10u – 4u = 6u = 54

Check

u = 9

At first

Apples -> 4u = 36

Oranges -> 10u = 90

In the end

Apples -> ¼ × 36 = 9

Oranges -> 90 – 75 = 15

9 : 15 = 3 : 5

Checked

Ans: 36

If you require 1 to 1 personalised help/tuition (P5 Mathematics) – other subjects available too, please feel free to contact me at 98570969 (SMS/Whatsapp only, will text you when is a convenient time to call if needed) and we can discuss this further. I am a dedicated and committed tutor with numerous experience. I am flexible and offer ad-hoc tution and crash courses in addition to the regular tution which has been immensely popular among students.

At first: 2 : 5

3/4 of apples and 75 oranges given away,

Later: 3 : 5

Convert the ratios such that no. of units of apples (left) is 1/4 of what is at first. 

 2 x 1/4 = 1/2 unit left.

So tweak the final ratio, instead of 3 :5, it will become 1/2 : 5/6

No. of units of oranges given away = 5 – 5/6 = 25/6

25/6 unit of oranges = 75

1/6 unit of oranges = 3

5 units of oranges (number of oranges at first) = 3 x 6 x 5 = 90

Apples at first = 90/5 *3 = 54

Difference in apples and oranges at first = 90 – 54 = 36

Sorry. I dun know what u r trying to say. Please explain in simpler terms.