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19 Oct 2020, 21:07
Kudos
Bookmarks
wfmd
I used this approach as well. Glad i'm not the only one
15 Nov 2020, 17:59
Kudos
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Gear P makes 10 revolutions per minute
\(\frac{10 revolutions}{60 seconds} = \frac{ 1 revolution }{ 6 seconds}\)
Gear Q makes 40 revolutions per minute
\(\frac{40 revolutions}{60 seconds} = \frac{4 revolution }{ 6 seconds}\)
\(\frac{4x}{6} = \frac{x}{6} + 6\)
\(\frac{4x}{6} = x + \frac{36}{6}\)
\(4x = x + 36\)
\(3x = 36\)
\(x = 12\)
Answer is D.
\(\frac{10 revolutions}{60 seconds} = \frac{ 1 revolution }{ 6 seconds}\)
Gear Q makes 40 revolutions per minute
\(\frac{40 revolutions}{60 seconds} = \frac{4 revolution }{ 6 seconds}\)
\(\frac{4x}{6} = \frac{x}{6} + 6\)
\(\frac{4x}{6} = x + \frac{36}{6}\)
\(4x = x + 36\)
\(3x = 36\)
\(x = 12\)
Answer is D.
