book Maths Puzzle Numerical Ability

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?

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book Other Question

Find two numbers with a geometric mean of sqrt 24 given that one number is two more than the other. A car is driving at 65 miles per hour on a highway that follows railroad tracks. A train traveling 80 miles per hour passes the car. How long after the train passes is it 20 mile