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A contractor combined x tons of a gravel mixture that contained 10 percent gravel G

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A contractor combined x tons of a gravel mixture that contained 10 percent gravel G, by weight, with y tons of a mixture that contained 2 percent gravel G, by weight, to produce z tons of a mixture that was 5 percent gravel G, by weight. What is the value of x ?
 

(1) y = 10
(2) z = 16

Official Answer

1 Best Answer

jaipster
1
Best answer
Let set up  the equation, total wt of G in X + total wt of G in Y = total wt of G in Z
0.1x + 0.02y = 0.05z
and we also know
x + y = z
We have 2 equations 3 unknowns, but both the conditions provide value of one variable. Hence any is SUFFICIENT
answered Jun 12, 2014 by Senior Associate (475 points)
selected Jun 12, 2014 by
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Jyotsna Mehta

Indian School of Business, Co'18

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