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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how do I solve this: A piece of gravel is kicked from the roof of a building, 240 feet above the ground. After t seconds, the piece of gravel has fallen 16t2 (T square root)feet. One number is 3 less than another. If 7 times the smaller number minus 3 times the larger number is 7, find the two numbers.