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mix and alligation

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Manager
Joined: 09 May 2009
Posts: 204

Kudos [?]: 268 [0], given: 13

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16 Dec 2009, 03:18
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67% (01:24) correct 33% (01:44) wrong based on 21 sessions

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A breakfast that consists of 1 ounce of corn puffs and 8 ounces of fruit X provides 257 calories. When 8 ounces of fruit Y is substituted for the 8 ounces of fruit X, the total number of calories is reduced to 185. If fruit X provides 1.8 times as many calories as fruit Y, how many calories does 8 ounces of fruit Y alone provide ?
(A) 11.25
(B) 72
(C) 90
(D) 95
(E) 129.6
_________________

GMAT is not a game for losers , and the moment u decide to appear for it u are no more a loser........ITS A BRAIN GAME

Kudos [?]: 268 [0], given: 13

Senior Manager
Joined: 30 Aug 2009
Posts: 283

Kudos [?]: 191 [1], given: 5

Location: India
Concentration: General Management

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16 Dec 2009, 04:18
1
KUDOS
xcusemeplz2009 wrote:
A breakfast that consists of 1 ounce of corn puffs and 8 ounces of fruit X provides 257 calories. When 8 ounces of fruit Y is substituted for the 8 ounces of fruit X, the total number of calories is reduced to 185. If fruit X provides 1.8 times as many calories as fruit Y, how many calories does 8 ounces of fruit Y alone provide ?
(A) 11.25
(B) 72
(C) 90
(D) 95
(E) 129.6

1C + 8X = 257 ----1
1C + 8Y = 185 ----2
subtracting 2 from 1 we get
8X - 8Y = 72 or X - Y = 9. now X = 1.8 Y

so 1.8Y - Y = 9 or 0.8Y = 9 or 8Y = 90....C

Kudos [?]: 191 [1], given: 5

Manager
Joined: 09 May 2009
Posts: 204

Kudos [?]: 268 [0], given: 13

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16 Dec 2009, 04:19
kp1811 wrote:
xcusemeplz2009 wrote:
A breakfast that consists of 1 ounce of corn puffs and 8 ounces of fruit X provides 257 calories. When 8 ounces of fruit Y is substituted for the 8 ounces of fruit X, the total number of calories is reduced to 185. If fruit X provides 1.8 times as many calories as fruit Y, how many calories does 8 ounces of fruit Y alone provide ?
(A) 11.25
(B) 72
(C) 90
(D) 95
(E) 129.6

1C + 8X = 257 ----1
1C + 8Y = 185 ----2
subtracting 2 from 1 we get
8X - 8Y = 72 or X - Y = 9. now X = 1.8 Y

so 1.8Y - Y = 9 or 0.8Y = 9 or 8Y = 90....C

grt! thanks c is the ans
_________________

GMAT is not a game for losers , and the moment u decide to appear for it u are no more a loser........ITS A BRAIN GAME

Kudos [?]: 268 [0], given: 13

Re: mix and alligation   [#permalink] 16 Dec 2009, 04:19
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