Two numbers are in the ratio and their sum is . What is the first number in the ratio?
Answer and explanation
Correct answer: D. 9
- Step 1: Determine the total number of parts in the ratio: parts.
- Step 2: Divide the total sum by the number of parts to find the unit value: .
- Step 3: Multiply the unit value by the first number's share ( parts): .
Answer
9.
Why not the others: - 3 is the value of a single ratio part (). - 21 is the second number in the ratio (), not the first. - 12 adds rather than subtracts the constant term in the final step.
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