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If a lathe machine manufactures screws and bolts at a constant rate

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If a lathe machine manufactures screws and bolts at a constant rate  [#permalink]

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New post 21 Oct 2018, 23:16
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A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

88% (00:55) correct 13% (01:49) wrong based on 40 sessions

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If a lathe machine manufactures screws and bolts at a constant rate, how much time will it take to manufacture 1000 bolts?


(1) It takes the lathe machine 28 seconds to manufacture 20 screws.

(2) It takes the lathe machine 1.5 times more time to manufacture one bolt than to manufacture one screw.

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If a lathe machine manufactures screws and bolts at a constant rate  [#permalink]

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New post 22 Oct 2018, 00:21
From statement 1:

lathe machine takes 28 seconds to manufacture 20 screws. But no info about the time taken to manufacture bolts.
Insufficient.

From statement 2:

lathe machine 1.5 times more time to manufacture one bolt than to manufacture one screw.
Here, only ratio of time taken is given. Clearly insufficient.

Combining both:

1 screw is manufactured in 20/28 sec or 5/7 sec.
1 bolt takes \(\frac{3}{2}(\frac{20}{28})\) sec = 15/14 sec.

then 1000 bolts = \(1000*\frac{15}{14}\) = \(500*\frac{15}{7}\) seconds.

C is the answer.
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If a lathe machine manufactures screws and bolts at a constant rate &nbs [#permalink] 22 Oct 2018, 00:21
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