book Maths Puzzle Numerical Ability

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book Other Question

As shown on a travel map, one route measures 5 and 1/8 inches and the other 5 and 1/2 inches. If 1 inch represents 80 miles, how many miles difference in distance is there between when the sum of 3.0 and 5.0 is subtracted from the product of 3.0 and 5.0, what is the difference?(the answers are....23.0, 20.0, 7.0, or none of these)