book Maths Puzzle Numerical Ability

4x+y=14
x+5y=13

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book Other Question

A cube of side 2 cm has a hole of radius 1 cm drilled out of all 3 sides. What is the volume remaining.

reworded: A cube has 3 cylinders cut from all three sides, find the volu
21 X 2 - 54 / 9

The agruement is the order in which the expression is calculated.