exam Maths Puzzle Numerical Ability

CAN SOMEONE PLEASE HELP ME WITH THIS PROBLEM:

IF g(x) = 3f(x) AND f(13) = 12, THEN g(13)=

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exam Other Question

find (f of g)(7)

x 4 5 6 7 x 4 5 6 7
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f(x) 6 7 4 5 g(x) 6 5 7 4 The larger of two numbers is 1 more than twice the smaller. The sum of the numbers is 20 less than three times the larger. Find the numbers. I need this to be a system of two equations in two variables.