A jar contains 10 red marbles and 30 green ones. How many red marbles – McqOptions

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1.	A jar contains 10 red marbles and 30 green ones. How many red marbles must be added to the jar so that 60% of the marbles will be red?
A.	25
B.	30
C.	35
D.	40
Answer» D. 40

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