book Maths Puzzle Numerical Ability

(-3xy^-9)^-2/(xy^-7)^-2

Simplify the expression using positive exponents only.

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book Other Question

How many Kilograms of water must be evaporated from 60 Kilograms of 5% salt solution to produce a 20% solution ?

Thanks ! Complete the ordered pair to make a solution to the given equation (-7/2, ?); the equation is
-2x+3y=25