Questions on Word Problems: Problems on percentages, ratios, and fractions answered by real tutors!

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Question 149105: A 3:4:1 concrete mix means that for every 2 parts of sand, 3 parts of gravel, and 1 part of cement. How much sand and cement should be used in the mix compound of 27 cubic feet of gravel? Thank you for helping me figure this out. God bless you.: A 3:4:1 concrete mix means that for every 2 parts of sand, 3 parts of gravel, and 1 part of cement. How much sand and cement should be used in the mix compound of 27 cubic feet of gravel? Thank you for helping me figure this out. God bless you.
Answer by tennisbuff07(20) About Me  (Show Source):
You can put this solution on YOUR website!
since all the parts are in equal proportions, you can imagine that you need six parts (3+2+1) in order to make a whole. divide 27 by 6 to get 4.5
this means you will need :
4.5 parts cement
9.0 parts sand
13.5 parts gravel
the parts in this case are cubic feet