The ratio of to is . If is added to and is subtracted from , the new ratio of to is . What is the value of ?
Answer and explanation
Correct answer: C.
- Step 1: Let and . Formulate the ratio equation: .
- Step 2: Cross-multiply and solve for : .
- Step 3: Compute and : and . Sum them: .
Answer
.
Why not the others: is the value of alone; adds rather than subtracts the constant term in the final step in solving for ; is the value of alone; is .
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