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A jar contains 10 red marbles and 30 green marbles . How many red marbles must be added to the jar so that 60% of the marbles will be red ?

Correct Answer: 35
New percentage of green marbles = 100% - 60% = 40% Now, 40% of total marbles = 30 [number of green marbles remains unchanged] So, total number or 100% of marbles = 30 x 100 / 40 = 75 More red marbles required = 75 - (10 + 30) = 35

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