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to mix 1 cubic meter of cement at a ratio of 3:1 how many 20kg of sand and 25kg bags of cement will be needed? we have now cut down to 1/2 a cubic metre apparently.The consensus for 1/2 a cube seems to be, 1 tonne sand, 14 bags cement.This should give 3:1 by volume! ( use a bucket for easy and accurate measuring.Do not mix it by weight).
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