SOLUTION: A boy who obtains 64 marks in a paper gets 80% of the total marks. What is the full marks of the paper?

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Question 1013695: A boy who obtains 64 marks in a paper gets 80% of the total marks. What is the full marks of the paper?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
I'm thinking you mean "marks" as "points."
If so, then we can solve this using a proportion:
64%2F80+=+x%2F100
Now cross-multiply and get
80x = 6400 and
x = 80 marks