exam Maths Puzzle Numerical Ability

How do you find the informal inverse of an equation?

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How do you solve the square root of -108 minus the square root of -48 I am having difficulty setting up this word problem. If a taxi charges .50 for the first 1/5 of a mile, and .20 for every 1/10 of a mile after that, how much would it cost to go 2 miles?