book Maths Puzzle Numerical Ability

when you are dividing exponents do u add them or subtract them?

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book Other Question

Solution A is 8% acid and Solution B is 4% acid. If a technician wants to mix them to make 150 liters of Solution C which is 6% acid, how many liters of each should be mixed together?
thanks for the help!
(y^3y^-2)/(y^-5y)



^^whats the answer? I tried doing it a million times :/