Exams › SSC CGL (Prelims) › General

Red, blue, and green balls are in the ratio $2:3:5$. If 15 red balls and 10 blue balls are added, how many green balls should be added so that the ratio becomes $3:4:6$?

1. 3
2. 5
3. 7
4. 0

Correct answer: 0

Solution

Let the original numbers be $2x, 3x, 5x$. After adding, the numbers become $2x+15, 3x+10,$ and $5x+g$. Since the new ratio is $3:4:6$, we get $2x+15=3k$ and $3x+10=4k$. Solving gives $x=15$ and $k=15$, so $5x+g=6k=90$, hence $g=0$.

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