7
Answer: CSet 4: Linear Equations (Intermediate)
Explanation
It takes Machine A x hours to complete a job. Machine B takes 2x hours. Together they take 4 hours. What is x?
What is x?
A.
4
B.
8
C.✓ Correct
6
D.
12
Detailed Explanation
Choice C is correct. 1/x + 1/2 x = 1/4. LCD = 4 x. 4 + 2 = x. x = 6.
Key Steps:
•
The correct answer is 6
Why others are wrong:
A: Choice A is incorrect and may result from a calculation error.
B: Choice B is incorrect and may result from a calculation error.
D: Choice D is incorrect and may result from a calculation error.
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