exam Maths Puzzle Numerical Ability

One number is 5 times another. The sum of the numbers is 72. What are the numbers?

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exam Other Question

A circular sheet of paper of radius 6 cm is cut into three equal sectors, and each sector is formed into a cone with no overlap. What is the height in centimeters of each cone? Use the "ac" test to determine if the following trinomial can be factored.
x^2+2x+3

Please show me the steps to determine this. Thank you!