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1. If a : b = 3 : 5 and a : c = 5 : 7, what is the value of b : c?
- A. 3 : 7
- B. 3 : 7
- C. 3 : 7
- D. 3 : 7
Answer: Option B
Explanation:
Here, a : b = 3 : 5 = (3×5) : (5×5) = 15 : 25
Again, b : c = 5 : 7 = (5×3) : ( 7×3) = 15 : 21
So, a : b : c = 15 : 25 : 21
Therefore, b : c = 25 : 21
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