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# John can eat x doughnuts in y minutes. If Chen can eat doughnuts three

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Intern
Joined: 06 Apr 2012
Posts: 30
John can eat x doughnuts in y minutes. If Chen can eat doughnuts three  [#permalink]

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28 Mar 2016, 01:19
3
00:00

Difficulty:

55% (hard)

Question Stats:

65% (02:20) correct 35% (02:24) wrong based on 111 sessions

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John can eat x doughnuts in y minutes. If Chen can eat doughnuts three times as fast as John, how many doughnuts will John and Chen eat in an hour?

A) $$15 (\frac{4x}{4})$$
B) $$60(\frac{3x}{y})$$
C) $$15(\frac{16x}{y})$$
D) $$60(\frac{x}{y})$$
E) $$60(\frac{x}{3y})$$

Math Expert
Joined: 02 Aug 2009
Posts: 7999
Re: John can eat x doughnuts in y minutes. If Chen can eat doughnuts three  [#permalink]

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28 Mar 2016, 05:37
2
1
kalita wrote:
John can eat x doughnuts in y minutes. If Chen can eat doughnuts three times as fast as John, how many doughnuts will John and Chen eat in an hour?

A) $$15 (\frac{4x}{4})$$
B) $$60(\frac{3x}{y})$$
C) $$15(\frac{16x}{y})$$
D) $$60(\frac{x}{y})$$
E) $$60(\frac{x}{3y})$$

Hi,

John can eat x doughnuts in y min
so, chen will eat 3x in y mins
Both can eat x+3x in y mins..
If in y min, Both can eat 4x.

in 1 min, both will eat $$4\frac{x}{y}..$$
and in 60 min or 1 hr, both will eat= $$60*\frac{{4x}}{y} = 15 *\frac{{16x}}{y}$$
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Re: John can eat x doughnuts in y minutes. If Chen can eat doughnuts three  [#permalink]

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14 Jan 2019, 19:23
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Re: John can eat x doughnuts in y minutes. If Chen can eat doughnuts three   [#permalink] 14 Jan 2019, 19:23
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