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1. 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 ?
- A. 25
- B. 25
- C. 25
- D. 25
Answer: Option B
Explanation:
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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