book Maths Puzzle Numerical Ability

Find two numbers with a geometric mean of sqrt 24 given that one number is two more than the other.

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book Other Question

Please help me with this equation 3/5n-2=1/5n+3 A bag of marbles has twice as many blue marbles as green marbles, and the bag has at least 18 marbles in it. At least how many green marbles does it have?