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10152012, 09:42 AM  #1 
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Mathematical Challenge
If a cement additive calls for one pound per cubic yard, then how much is needed for a 60# bag?

10152012, 09:46 AM  #2  
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Mathematical ChallengeQuote:
Example: If the 60# bag makes say 1/2 cubic yard crete then your ratio would be 1/2 lb(8 oz) of additive for 1/2 cubic yard of crete. If the 60# bag makes say 3/8 cubic yard of crete then your ratio would be 3/8 lb(6 oz) of additive for 3/8 cubic yard of crete. Appears to be a 1:1 ratio as long as you keep the units in pounds of additive per cubic yards of crete. Pretty simple Last edited by hammerlane; 10152012 at 11:02 AM. 

10152012, 10:32 AM  #3  
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Mathematical ChallengeQuote:
A 60# bag is 0.45 cubic feet,and there's 27 cubic feet to a cubic yard,you do the math,and whatever you do don't let hammerlane do it. Last edited by Canarywood1; 10152012 at 10:37 AM. 

10152012, 11:07 AM  #4 
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Mathematical ChallengeWhat??? Based on the poster's original statement of a cement additive that calls for one pound of additive per one cubic yard of crete if you get something different from what I have you best check your abacus. 0.45 cubic feet is 1/60 of a cubic yard. So you need 1/60 of a lb of additive for 1/60 of a cubic yard of crete. 1/60 of a lb is about 1/4 oz Whats wrong with the math? Last edited by hammerlane; 10152012 at 11:12 AM. 
10152012, 12:52 PM  #5 
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Mathematical Challenge
OOPS i reread the original post,my humble apologies to you hammerlane,you are right.

10152012, 02:52 PM  #6  
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Mathematical ChallengeQuote:
Of course a 60# bag of crete will never equal 1/2 yard of crete. I understand the ratio you are trying to convey, it was just weird stating it that way. Andy. 

10152012, 03:12 PM  #7 
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Mathematical Challenge
.25 ounce per 60# bag............

10152012, 08:15 PM  #8  
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Mathematical ChallengeQuote:
Don't know how this is a weird way of stating it. 

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