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Two mixtures A and B contain milk and water in the ratios

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Re: Two mixtures A and B contain milk and water in the ratios [#permalink]

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New post 22 Nov 2014, 13:24
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Re: Two mixtures A and B contain milk and water in the ratios [#permalink]

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New post 15 Jun 2016, 06:53
Hello from the GMAT Club BumpBot!

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Two mixtures A and B contain milk and water in the ratios [#permalink]

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New post 15 Jun 2016, 12:44
let x=gallons of A to be mixed
2/7*x+5/9*90=.4(x+90)
x=490/4=122.5 gallons

Last edited by gracie on 23 Dec 2016, 14:32, edited 1 time in total.

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Re: Two mixtures A and B contain milk and water in the ratios [#permalink]

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New post 02 Aug 2016, 03:37
bmwhype2 wrote:
Two mixtures A and B contain milk and water in the ratios 2:5 and 5:4 respectively. How many gallons of A must be mixed with 90 gallons of B so that the resultant mixture contains 40% milk?

A. 144
B. 122.5
C. 105.10
D. 72
E. 134



I tried two approaches.one in which i convereted 40% to fraction form and the second in which i converted 2/7 to % form.The later method yielded the correct OA.why???

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Re: Two mixtures A and B contain milk and water in the ratios [#permalink]

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New post 02 Aug 2016, 06:34
How abt this approach.

of all the options provided only 122.5 is divisible by 7 ie. ratio of A is 2:5, so the mixture need to be in multiple of 7.

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Re: Two mixtures A and B contain milk and water in the ratios [#permalink]

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New post 23 Dec 2016, 09:03
2x+50/5x+40=4/6, find x, then don't get into decimals, approx 17.something then 2(17)+5(17)= approx 122

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Re: Two mixtures A and B contain milk and water in the ratios   [#permalink] 23 Dec 2016, 09:03

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