exam Maths Puzzle Numerical Ability

In cubic meters, how much greater is the volume of a cylinder with a height 21 m and a radius 12m than the volume of a square prism with a height 21 m and base 12 m on a side?

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exam Other Question

Assume that 420 members of the House are available to vote. How many votes are necessary to make up a majority, which is anything over ? Solve and check each of the following equations for x. This is easy and i think I am thinking to hard. Please help.
x/6 - x/8 = 1