book Maths Puzzle Numerical Ability

I need help with these two problems please help me.

The Greater of two consecutive integers is 15 more than twice the smaller. Find the integers.

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book Other Question

What is the square root of x^2+y^2 (1) lizzie had two amounts of pens. the product of these 2 amounts proved to be 126. one factor is 3 greater than 3 times the other. what are the 2 amounts of pens she has?