A : B = 3 : 5 and B : C = 4 : 7. What is A : B : C?
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Worked Solution
Step 1: Make B the same in both ratios. LCM of 5 and 4 = 20.
Step 2: A : B = 3 : 5 = 12 : 20 (multiply by 4).
B : C = 4 : 7 = 20 : 35 (multiply by 5).
Step 3: A : B : C = 12 : 20 : 35.
Answer: 12 : 20 : 35
Correct answer: 12 : 20 : 35
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