exam Maths Puzzle Numerical Ability

Given f(x)= 3x+3, find f(a+1).

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exam Other Question

Yellow paint and blue paint must be mixed in the ratio 2:3 to produce the desired shade of green paint. How much of each color should be used to produce 4 L of green paint? Solve the linear equations:

A + B + C = 0
4A - 10B = 3
-10B + 5C = 6