exam Maths Puzzle Numerical Ability

i would like you to help me on this problem.
it is dealing with fractions in the substitution method.

solve by the substitution method:
m over 3 +

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exam Other Question

Find the following if f(x) = 5x -1 f(a-2)

a-2 = 5(a-2) - 1
a-2 = 5a -10 - 1
-2 = -4
1 = 2

Double checking to see if I did these right How many liters of a solution containing 22% sugar and how many liters of another solution containing 31% sugar must be mixed together to make 680 liters of solution containing 27% sugar?