exam Maths Puzzle Numerical Ability

One number is 2 times another. If the sum of their reciprocals is 1/5, find the two numbers. Define variables, set up equation and solve.

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exam Other Question

the circumference of a circle is is 56.52 inches, to the nearest tenth of an inch, find the area of the circle,use pi=3.14 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!