exam Maths Puzzle Numerical Ability

I need some help checking this question. Thanks.

Simplify: y(to the power of 60) + y(to the power of 45) / y(to the power of 15)

Answer: y(to the power of 30)(y(to the power

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Helen Weller invested $15,000 in an account that pays 11% simple interest. How much additional money must be invested in an account that pays 14% simple interest so that the average return on the two investments amounts to 12%? Can I have some help with the following problem?

The lift L on an airplane wing at takeoff varies jointly as the square of the speed s of the plane and the area A of its wings.