exam Maths Puzzle Numerical Ability

simplify
x+2
over x
over
x-2
over3x

A)-3
B)3(x+2)
over
x-2
C)-4
over
3
D)x^2-4
over
3x^2

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exam Other Question

Use two variable and the methods for solving word problems to solve:
The sum of two number is 40, one number is 8 more than the other. Find the
numbers
Solve for m:

m^2 - 8m + 12=0