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A contractor mixes cement, water, sand, and gravel in a ratio of 1:3:4

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A contractor mixes cement, water, sand, and gravel in a ratio of 1:3:4  [#permalink]

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New post 19 Feb 2019, 23:41
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A
B
C
D
E

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  15% (low)

Question Stats:

79% (01:09) correct 21% (01:02) wrong based on 39 sessions

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A contractor mixes cement, water, sand, and gravel in a ratio of 1 : 3 : 4 : 2 by weight to make concrete. How many pounds of sand are needed to make 28 pounds of concrete?

A. 2.8
B. 5.6
C. 8.4
D. 11.2
E. 13.6

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Re: A contractor mixes cement, water, sand, and gravel in a ratio of 1:3:4  [#permalink]

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New post 19 Feb 2019, 23:58
Answer must be D.

required sand = 28*4/10 = 11.2

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Re: A contractor mixes cement, water, sand, and gravel in a ratio of 1:3:4  [#permalink]

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New post 20 Feb 2019, 02:12
Bunuel wrote:
A contractor mixes cement, water, sand, and gravel in a ratio of 1 : 3 : 4 : 2 by weight to make concrete. How many pounds of sand are needed to make 28 pounds of concrete?

A. 2.8
B. 5.6
C. 8.4
D. 11.2
E. 13.6


total = 10
so sand 4/10 ; .4
.4 * 28 = 11.2
IMO D
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Re: A contractor mixes cement, water, sand, and gravel in a ratio of 1:3:4   [#permalink] 20 Feb 2019, 02:12
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A contractor mixes cement, water, sand, and gravel in a ratio of 1:3:4

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