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24 Dec 2018, 22:25
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C
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Difficulty:
35%
(medium)
Question Stats:
71% (01:27) correct
29%
(01:38)
wrong
based on 303
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If cement, gravel, and sand are to be mixed in the ratio 3:5:7 respectively, and 5 tons of cement are available, howmany tons of the mixture can be made? (Assume there is enough gravel and sand available to use all the cement.)
A. 15
B. 20
C. 25
D. 30
E. 75
A. 15
B. 20
C. 25
D. 30
E. 75
13 Jan 2019, 04:55
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Quote:
If cement, gravel, and sand are to be mixed in the ratio 3:5:7 respectively, and 5 tons of cement are available, howmany tons of the mixture can be made? (Assume there is enough gravel and sand available to use all the cement.)
A. 15
B. 20
C. 25
D. 30
E. 75
A. 15
B. 20
C. 25
D. 30
E. 75
So... 3x+5x+7x=15x,
3x=5
x=5/3
15*5/3=25
General Discussion
fitzpratik
Posts: 226
24 Dec 2018, 22:34
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Bunuel
If cement, gravel, and sand are to be mixed in the ratio 3:5:7 respectively, and 5 tons of cement are available, howmany tons of the mixture can be made? (Assume there is enough gravel and sand available to use all the cement.)
A. 15
B. 20
C. 25
D. 30
E. 75
A. 15
B. 20
C. 25
D. 30
E. 75
the mixture is in ratio 3:5:7 , so with 5 tons of cement, ratio becomes 5:x:y (where X and Y are the total quantities of gravel and sand)
3/5 = 5/x; X = 25/3
and
3/7 = 5/y; Y = 35/3
Total mixture = 5 + 25/3 + 35/3
= 5 + 60/3
= 5 + 20
= 25
answer = C
