book Maths Puzzle Numerical Ability

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?

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book Other Question

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

r-4 divided by 7-r
how could you subtract 48 from 57,62,78,85