exam Maths Puzzle Numerical Ability

i need help with exxponents

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Please Help!!!

A grocery store may increase the original price of a product to cover the expenses of running the store. The markup is the amount that is added to the original c
Please help me to simplify each complex fraction and reduce each answer to lowest terms:

42) 1/3+1/y over y/3-3/y


and

50) ab+b^2/4ab^5 over a+b/6a^2b^4


Thank you very much!