book Maths Puzzle Numerical Ability

ok it asks me to find any real number for the following problem:

r-4 divided by 7-r

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Andrew has $547 in ten-dollar, five-dollar and one-dollar bills. There were 91 bills in all, and 10 more five-dollar bills than ten-dollar bills. Ho Paul had 30 marbles than Peter. After Peter gave Paul 15 more marbles, Paul had twice as many marbles as Peter. How many marbles did they have alltogether?