Question : If a : b = 4 : 5 and b : c = 3 : 10, then a : c is:
Option 1: 4 : 10
Option 2: 5 : 3
Option 3: 25 : 6
Option 4: 6 : 25
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Correct Answer: 6 : 25
Solution : a : b = 4 : 5 = 12 : 15 b : c = 3 : 10 = 15 : 50 ⇒ a : b : c = 12 : 15 : 50 ⇒ a : c = 12 : 50 = 6 : 25 Hence, the correct answer is 6 : 25.
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