exam Maths Puzzle Numerical Ability

If t varies inversely as v, find t when v=13, if it is known that t=2 when v=5.

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exam Other Question

A car rents for $30 per day plus 18cents per mile. You are on a budget of $75. what mileage would allow you to stay within your budget? I am stuck on correct answer for:

if the width of a rectangle is one-third of its length and its length is 12, what is the area of the rectangle?

I am not using any specific book. I am just practicing..