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If two lathe machines work simultaneously at their respective constant

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If two lathe machines work simultaneously at their respective constant  [#permalink]

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New post 21 Oct 2018, 23:17
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Difficulty:

  35% (medium)

Question Stats:

57% (01:15) correct 43% (01:00) wrong based on 29 sessions

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If two lathe machines work simultaneously at their respective constant rates to manufacture bolts, how many bolts do they manufacture in 10 minutes?

(1) One of the machines manufactures bolts at the constant rate of 50 bolts per minute.
(2) One of the machines manufactures bolts at twice the rate of the other machine.

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Re: If two lathe machines work simultaneously at their respective constant  [#permalink]

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New post 21 Oct 2018, 23:25
From statement 1:
One machine manufactures 50 bolts per minute. But, no info about the other machine.
Insufficient.

From statement 2:
One of the machines manufactures bolts at twice the rate of the other machine. No info about how much one machine manufactures.
Insufficient.

Combining both:

Two cases: One machine manufactures 50 and the other 100 in one minute. Or one machine manufactures 25 and the other 50 bolts.
Hence insufficient.

E is the answer.
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Re: If two lathe machines work simultaneously at their respective constant &nbs [#permalink] 21 Oct 2018, 23:25
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