Q: A bag contains red, blue and black balls. The ratio of red to blue balls is 3 : 5. The ratio of black to red balls is 3 : 4. What is the ratio of blue to black balls?
A.
5 : 3
B.
4 : 5
C.
9 : 20
D.
20 : 9
Correct Answer:
Option D -
Explanations:
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