15 $ is the answer
3.75 x
4. = 15$
Because there nobody that teaches them how to do math
Answer:
this wont work
Step-by-step explanation:
kidding will type awnser shortly
Let the full marks be represented by = x
As given, 80% of x is 75
So,

x= 
x=93.75
Hence, full marks is 93.75
We can check also-
=75