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It depends on whether you mean 28 mm x 28 mm x 3 mm or 28 metres x 28 metres x 3 metres or some other units.

Maybe the answer should be 27 and let you figure out 27 lots of what.

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Q: How much cement needed for 28 x 28 x 3?
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A concrete mix requires 2 parts sand and 3 parts cement how many pounds of sand are needed for 75 pounds of cement?

You already have the amount of cement you need 75lbs so that is your 3 parts cement. 25 + 25 + 25 =75. Now add the 2 parts sand 25 + 25 = 50lbs. --------------------------------------------------------------------------------------------- Find fractional parts. There is a total of 5 parts. 2/5 = .4 is the fractional part of sand and 3/5= .6 is the fractional part of cement. Then .4 x 75 = 30lb is the sand and .6 x 75 = 45lb is the cement. This gives 75lbs of concrete. If you are asking how much sand to add to 75lbs cement the top answer is correct.

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