exam Maths Puzzle Numerical Ability

Becky has as many dimes as Ryan and Amy have together. Ryan has 2 more dimes than Amy, and Amy has one-third as many dimes as Becky has. How many dimes does each have?

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Can someone explain how I am supposed to solve by substitution with the problems x-y=5 x+2y=7 and 3b+2a=2 -2b+2a=8 The sides of ne triangle have lengths 8, 15, and 17. The perimeter of a similar triangle is 120. Find the lengths of the sides of the second triangle.