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If Machine X can make 40 widgets in 8 minutes, how many widg

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If Machine X can make 40 widgets in 8 minutes, how many widg [#permalink] New post 19 Oct 2017, 22:47
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Question Stats:

85% (00:34) correct 14% (00:00) wrong based on 7 sessions
If Machine X can make 40 widgets in 8 minutes, how many widgets can it make in 1 hour?

(A) 90

(B) 180

(C) 240

(D) 300

(E) 320

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Re: If Machine X can make 40 widgets in 8 minutes, how many widg [#permalink] New post 20 Oct 2017, 07:15
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Using ratios, we get 40:8 = x:60, where 60 is 1 hour in minutes. Then, solving for x we get \(x = \frac{60*40}{8} = 300\)

Answer D
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Re: If Machine X can make 40 widgets in 8 minutes, how many widg [#permalink] New post 08 Jan 2018, 11:01
Expert's post
Bunuel wrote:
If Machine X can make 40 widgets in 8 minutes, how many widgets can it make in 1 hour?

(A) 90

(B) 180

(C) 240

(D) 300

(E) 320


Since 1 hour is 60 minutes, Machine X can make 40/8 x 60 = 5 x 60 = 300 widgets.

Alternate solution:

We can set up a proportion in which x is the number of widgets that can be made in 1 hour, or 60 minutes:

40/8 = x/60

5 = x/60

300 = x.

Answer: D
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Re: If Machine X can make 40 widgets in 8 minutes, how many widg   [#permalink] 08 Jan 2018, 11:01
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