PSAT Math Multiple-Choice Practice Question 626
Question: 626
Machine 1 can manufacture one box in A hours, and Machine 2 can manufacture an identical box in B hours. When working simultaneously, Machines A and B can produce 1 box in T hours. This relationship is given by the following formula:
What is the value of B in terms of the other two variables?
Correct Answer: A
Explanation:
(A) First, we'll solve for 
. To do this, subtract 
from both sides:
Don't be tempted to pick choice (C)! We've solved for , not for B as asked in the question. To solve for B, we must take the reciprocal of what we have:
This matches answer (A).
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