exam Maths Puzzle Numerical Ability

One positive number is three more than twice another. If the product is 27, find the numbers.

?? So stumped...please help~

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exam Other Question

Find the difference quutient :

f(x + h) - f(x)
_________________ (h does not equal 0)
h

f(x) = 2 + 4x One inlet pipe can fill an empty pool in 4 hours, and a drain can empty the pool in 8 hours. How long will it take the pipe to fill the pool if the drain is left open?