railway RRB Technician Grade 1 Mock Test 2024 Quantitative Aptitude Ratio and Proportion

In a bag the ratio of red balls to green balls is 4 ∶ 9. If 6 more green balls were added to the bag, the ratio of red balls to green balls would become 1 ∶ 3. How many red balls are there in the bag?

1
8
2
9
3
12
4
10
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