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Keri, Neill, and Rich use toilet paper in their apartment in a ratio

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antoxavier
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Keri, Neill, and Rich use toilet paper in their apartment in a ratio [#permalink] New post   05 Jul 2013, 07:50
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Keri, Neill, and Rich use toilet paper in their apartment in a ratio of 3:2:2. Rich buys two cases of toilet paper online for everyone`s use at 28 rolls per case, an average of $3.50/roll and a $14 delivery charge. If they each contribute to the cost of the toilet paper in direct proportion to the amount they use, how much must Keri contribute?

A. 87
B. 88
C. 89
D. 90
E. 92
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Bunuel
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Keri, Neill, and Rich use toilet paper in their apartment in a ratio [#permalink] New post   05 Jul 2013, 08:05
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antoxavier wrote:
Keri, Neill, and Rich use toilet paper in their apartment in a ratio of 3:2:2. Rich buys two cases of toilet paper online for everyone`s use at 28 rolls per case, an average of $3.50/roll and a $14 delivery charge. If they each contribute to the cost of the toilet paper in direct proportion to the amount they use, how much must Keri contribute?

A. 87
B. 88
C. 89
D. 90
E. 92


Two cases = 28*2 = 56 rolls.
Cost = 56*$3.5 + $14 = $210.

Keri's share = 3/(3+2+2) = 3/7.
Thus Keri must contribute 3/7*$210 = $90.

Answer: D.

Hope it's clear.
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Re: Keri, Neill, and Rich use toilet paper in their apartment in a ratio [#permalink] New post   20 Nov 2018, 00:52
Answer:
2 casex28 = 56 rolls..
56 rollsx 3.50 = 196
Add $14 delivery
Total 210$
Keri will pay 3/7th of total cost
That is 3/7 x 210= 90

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Re: Keri, Neill, and Rich use toilet paper in their apartment in a ratio [#permalink] New post   20 Nov 2018, 06:52
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Bunuel wrote:
Keri, Neill, and Rich use toilet paper in their apartment in a ratio of 3:2:2. Rich buys two cases of toilet paper online for everyone`s use at 28 rolls per case, an average of $3.50/roll and a $14 delivery charge. If they each contribute to the cost of the toilet paper in direct proportion to the amount they use, how much must Keri contribute?

A. 87
B. 88
C. 89
D. 90
E. 92


Ratio for K:N:R would be 7x= 56 ' as two sets and each set has 28 rolls'
x=8 K:N:R = 24:16:16 toilet paper

Cost of the whole set : 3.5*56+14= 210
Cost per roll: 210/56= 3.75
Amount K would have to pay 3.75$*24= 90$ option D
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Re: Keri, Neill, and Rich use toilet paper in their apartment in a ratio [#permalink]
20 Nov 2018, 06:52
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