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Re: Cake mix A is 80% flour and 20% sugar by weight. Cake mix B is 55% flo [#permalink]
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A is 80% flour, B is 55% flours and mixture is 65% flour.

So using weighted average method:

A-------------(A+B mixture)-----------B
(80%)_____(65%)_____________(55%)
<----------------> <-------------------->
____15 units__________10 units_____

So B/A = 15/10 = 3/2

In percentages = 60%

Hence option C is the answer.

For explanation of method refer to Weighted Average and Mixture Problems on the GMAT.

Hope it helped.

rohitgm wrote:
Cake mix A is 80% flour and 20% sugar by weight. Cake mix B is 55% flour and 45% sugar by weight. If a mixture of mixes A and B is 65% flour by weight, what percent of the weight of the mixture consists of cake mix B?

A. 40%

B. 50%

C. 60%

D. 65%

E. 66.66%
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Re: Cake mix A is 80% flour and 20% sugar by weight. Cake mix B is 55% flo [#permalink]
rohitgm wrote:
Cake mix A is 80% flour and 20% sugar by weight. Cake mix B is 55% flour and 45% sugar by weight. If a mixture of mixes A and B is 65% flour by weight, what percent of the weight of the mixture consists of cake mix B?

Mix A - 80%
Mix B - 55%
Mix A+B - 65%

\(80*x+55*(1-x)=65\\
x=60%\)


Option (C)
GMAT Club Bot
Re: Cake mix A is 80% flour and 20% sugar by weight. Cake mix B is 55% flo [#permalink]
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