exam Maths Puzzle Numerical Ability

Hat sizes are determined by measuring the circumference of one's head in either inches or centimeters. Use ratio and proportion to complete the following table.
Hat Size
7 1/2 r

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Please help me:

1. Joe has a collection of nickels and dimes that is worth $5.65. If the number of dimes were doubles and the number of nickels were increased by 8, the value o please help me with

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2^-3a^-3/c(2a^3c - 8a^3/c^2)

thank you!