exam Maths Puzzle Numerical Ability

WHAT IS THE PERIMETER OF A RECTANGLE IF THE LENGHT IS 7/10 IN. AND THE WIDTH IS 1/10IN.

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Hi my question is this: A 35-minute phone call cost $4.95.Introductory minutes cost $.16/min and additional minutes are $.11/min. How many minutes were billed at each rate?
I used to know how to do this problem but i for get can you please help me? solve for x. x+2/x-2=4/8