Book Maths Puzzle Co-ordinate geometry

Evaluate the expression and write the result i simplest form. if not possible, why?
15/32 divided by(-5/4) these are fractions.

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Book Other Question

Julie is 21 years older then kathy. in six years julie will be twice as old as kathy. what is the currnet ages? How to evaluate the expression in simplest form?
-3 7/10+1 1/20
-5/9+2/3