# algebra

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elmer burns works for a ready-mix concrete cmpany. elmer receives an order for 3.5 cubic yards of concrete. this mixture of concrete contains sand, cement, gravel, and water, for each pound of water, there are 5 lb of sand, 2 lb of cement, and 6 lb of gravel. find (a) the total weight of the order(in pounds), assuming a cubic yard of concrete weighs 4,000 lb, and (b) how many pounds of each ingredient are needed.

• algebra -

So 1# water
+ 5# sand
+ 2# cement
+ 6# gravel
Total = 14# for mix.
Total weight of the order = 3.5 Yd^3 x (4,000 lbs/1 yd^3) = 14,000 lbs.

water = 14,000 lbs x (1/14) = ??
sand = 14,000 lbs x (5/14) = ??
cement = 14,000 lbs x (2/14) = ??
etc.Check my thinking.

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