exam Maths Puzzle Numerical Ability

I have to solve for x.
a/3 = x/21

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exam Other Question

If a figure shows a graph of Y=(x-3)(x-a. Determine the value of a

Possible answers:
3
4
5
7

Please show me and a graph if you can.

Thank you One number is 12 more than another. The sum of the smaller number and twice the larger number is 39. Find the larger number.
5
7
17
34