exam Maths Puzzle Numerical Ability

10 < x < 20 and 40 < y < 60, find the largest value of x^/2y

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exam Other Question

hello, I need to know how to solve:
For what value(s) of C does 3x-4y=9 and 12x-16y=c have infinite solutions?
Thank you solve equation 3+5h-9=4(3h+4)-1