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As ratio is 1 : 2 : 4, there are 1 + 2 + 4 = 7 parts in total

Therefore 1 part is 1 m3 ÷ 7 = 1/7 m3

cement : sand : gravel = 1 : 2 : 4

→ 1 x 1/7 m3 : 2 x 1/7 m3 : 4 x 1/7 m3 =

  • 1/7 m3 ≈ 0.14 m3 cement;
  • 2/7 m3 ≈ 0.29 m3 sand;
  • 4/7 m3 ≈ 0.57 m3 gravel

[mortar and concrete is mixed by volume.]

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Q: How may cement sand and gravel in 1 cubic meter of concrete if the ratio is 1 is 2 is to 4?
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