Hello Aspirant,

Let me correct you first of all, you can get 25 out of 70 not 70 out of 25 so if you get 25 out of 70 then it comes out to be 35.714% so now you want to scale it on the scale of 50 and in all you got 35.714% so 35.714% of 50 is approx. 18. It means that you will get 18 marks out of 50 if you were getting 25 out of 70.

I hope this information helps you.

Good Luck!!