book Maths Puzzle Numerical Ability

Simplify 80x^3y^5/64x^4y^3.

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I need help with these questions:

________ is 24% of 400
________ is 9.5% of 1600
300 is _________% of 1500
7 is 5% of __________
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