exam Maths Puzzle Numerical Ability

How would you find 2 positive numbers that differ by 2 and have a product of 20? I dont know how to set up the equation in this instance.

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exam Other Question

Prove a^3-64/a^2-16=a^2+4a+16/a+4 help would be appreciated :

The number of blooming pansies increased by 160 percent over night. If they numbered 117 in the morning, how many pansies were blooming before the nightfall?