exam Maths Puzzle Numerical Ability

tom earned $6.25 per hour at his summer job. This was then $.85 less than joannas hourly pay. how much did johanna earn per hour

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exam Other Question

Simplify:

square root of 15x^6 * the square root of 16x^5

I got the answer 4x^5 square root of 15x. Is this correct? Thanks so much!! Suppose x and y satisfy both of follwing equations below. Then y = ?
x-3y=7 and 2x+4y=5

Thanks.