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A diet contains 300 grams of a mixture of two foods, food X

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A diet contains 300 grams of a mixture of two foods, food X [#permalink]

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A diet contains 300 grams of a mixture of two foods, food X and food Y. Food X contains 10 percent protein and food Y contains 15 percent protein. If a diet provides exactly 38 grams of protein daily, how many grams of food X are in the mixture?

(A) 150
(B) 145
(C) 100
(D) 160
(E) 140
[Reveal] Spoiler: OA

Last edited by Bunuel on 30 Jul 2012, 08:11, edited 1 time in total.
Edited the question and added the OA.
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New post 20 May 2003, 21:08
1.... 10/100*X + 15/100*Y = 38 (protein)

2.... X + Y = 300 (Total Mix)

Solve for X = 140
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New post 20 May 2003, 21:53
Thanks a lot. I think i did some silly mistake while solving the equation for the first time.
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Re: A diet contains 300 grams of a mixture of two foods, food X [#permalink]

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New post 30 Jul 2012, 07:52
ju_1 wrote:
A diet contains 300 grams of a mixture of two foods, food X and food Y. Food X contains 10 percent protein and food Y contains 15 percent protein. If a diet provides exactly 38 grams of protein daily, how many grams of food X are in the mixture?
(A) 150
(B)145
(C) 100
(D) 160
(E) 140


x(10%) y(15%)
38%
23% 28%

the protein parts in the final mixture for X:Y::23:28

hence

23 X
----------- = --------------
(23+28) 300

23/51 = x/300

x = 23 * 300
------------
51

hence x is approximately equal to 139.8

hence the answer is E
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Re: A diet contains 300 grams of a mixture of two foods, food X [#permalink]

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New post 30 Jul 2012, 08:13
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harshavmrg wrote:
ju_1 wrote:
A diet contains 300 grams of a mixture of two foods, food X and food Y. Food X contains 10 percent protein and food Y contains 15 percent protein. If a diet provides exactly 38 grams of protein daily, how many grams of food X are in the mixture?
(A) 150
(B)145
(C) 100
(D) 160
(E) 140


x(10%) y(15%)
38%
23% 28%

the protein parts in the final mixture for X:Y::23:28

hence

23 X
----------- = --------------
(23+28) 300

23/51 = x/300

x = 23 * 300
------------
51

hence x is approximately equal to 139.8

hence the answer is E


Keep it simple: \(0.1x+0.15(300-x)=38\) --> \(x=140\) (exactly).

Answer: E.
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Re: A diet contains 300 grams of a mixture of two foods, food X [#permalink]

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New post 13 Aug 2012, 00:41
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X contains 30 gms of protein (10% of 300 gms)
Y contains 45 gms of protein (15% of 300 gms)
Resultant mixture contains 38 gms of protien.

using scale method :

____8___________7___
30 38 45
w1 w2

therefore,
w1/w2 = 7/8

7x+8x=300 gms
=> x=20

so, w1 = 7x=7(20) = 140 gms
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Re: A diet contains 300 grams of a mixture of two foods, food X [#permalink]

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Re: A diet contains 300 grams of a mixture of two foods, food X [#permalink]

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New post 18 Apr 2014, 22:12
X+Y = 300

0.1X + 0.15Y = 38

X=140
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Re: A diet contains 300 grams of a mixture of two foods, food X [#permalink]

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New post 04 Jul 2015, 07:53
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Re: A diet contains 300 grams of a mixture of two foods, food X [#permalink]

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Re: A diet contains 300 grams of a mixture of two foods, food X [#permalink]

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New post 07 Aug 2016, 06:02
start with some numbers.
if x = 100, then y=200
protien from x = 10 and from y = 30 . total protein = 40. greater.. hmm. it means y is somewhat more than it should be. this implies x > 100.
x= 150 , then y=150
protein from x = 15 and from y = 22.5 total = 37.5..lesser
so answer is between 100 and 150 . if we see there are two choices 140 and 145. which one it should be?
well after increasing x by 50 we notice that we reduced total protein from 40 to 37.5 means 2.5. We just need to reduce the protein by 2.

Let us try 140 with this, protein from x = 14 , protein from y = 16+8 = 24. total = 38. this works!
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Re: A diet contains 300 grams of a mixture of two foods, food X [#permalink]

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New post 07 Aug 2016, 10:53
.10x+.15(300-x)=38
x=140 grams
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A diet contains 300 grams of a mixture of two foods, food X [#permalink]

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New post 07 Aug 2016, 13:25
Take equal proportion to have an idea of ratio,150 each. X will give 15g, Y will give 22.5g which is closer to 38 (37.5)
A little thought on the options D& E will give us E as the answer


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Re: A diet contains 300 grams of a mixture of two foods, food X [#permalink]

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New post 07 Aug 2016, 21:52
I am a little confused about the wording here.

The question says "a diet provides exactly 38 grams of protein daily..." is it referring to the same diet or some other diet which could be more or less than 300 grams?

I feel if it is referring to the same diet then it should mention "THE diet provides...", don't you think?


ju_1 wrote:
A diet contains 300 grams of a mixture of two foods, food X and food Y. Food X contains 10 percent protein and food Y contains 15 percent protein. If a diet provides exactly 38 grams of protein daily, how many grams of food X are in the mixture?

(A) 150
(B) 145
(C) 100
(D) 160
(E) 140
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Re: A diet contains 300 grams of a mixture of two foods, food X [#permalink]

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New post 25 Sep 2016, 06:46
10/100 (x) + 15/100 (300-x) = 38

10/100 (x) + 45 - 15/100 (x) = 38

-5/100 (x) = -7 --> x= 140
Re: A diet contains 300 grams of a mixture of two foods, food X   [#permalink] 25 Sep 2016, 06:46
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