book Maths Puzzle Numerical Ability

Hi, I need help on the following problem. Thanks!

The growth strain of bacteria is known to be exponential in nature. After an elapsed time of three hours the population in a

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book Other Question

if a car is traveling at 55 mph how far will it travel once you hit the brake? 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?