book Maths Puzzle Numerical Ability

What is the difference between (-16)^(5/4) and -16^(5/4)?

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book Other Question

A sum of money is divided between three men A B C in the ratio 7:5:1. If B has �2.50 more than C, How much does A receive?

I managed to get the answer but do not know the logic what is the algebraic expression for the verbal expression six times a number