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2015-05-20T20:16:48+08:00

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We have:
Sand:Gravel:Cement:Water
  4    :   4    :    3      :    1

We just take the ratio of water to cement which is 1:3.
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2015-05-21T14:34:30+08:00

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The answer is:
1 part water:3 parts cement

because in this mixture, you only used 1 part of water and then 3 parts of cement so since we are only needing water to cement, ignore the other two. Hope this helps =)
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