exam Maths Puzzle Numerical Ability

Find circumference of circle with a radius of 14 in. Use 22/7 for pi.

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exam Other Question

I am two digit number. I am twice the product of my digits. What number am I?

I know that the number is 36. As 2(3*6)=36. How can I arrive at a formulae to arrive this answer. Could some-one help with these questions thanks Tine!
4) CLASSIC PROBLEM - A traveling salesman (selling shoes) stops at a farm in the Midwest. Before he could knock on the door,