exam Maths Puzzle Numerical Ability

A cement pipe has an outside diameter of 11 1/4 in.and a wall thickness of 1 1/8 in. What is the inside diameter of the pipe?

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exam Other Question

Solve and check the equation for X

x/6 - x/8 = 1

This equation to me does nto equal 1:

x - x = 0

6 - 8 = -2

The equation should be -2 correct? I am having problem,s with this problem

Solve equations for X
x^2+4x+4=7

Thank a million for the help