exam Maths Puzzle Numerical Ability

What is the answer? I am new at this.

2 1/4 x r = n r

Thank you.

Malanna

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exam Other Question

5x+14-2x or 9-(4x+2) A lidless box is constructed from a square peice of tin by cutting a 10cm square from each corner and bending up the sides for the box. If the volume of the box is 1200cm cubed, find the dimensions to the nearest tenth of a centimetre.