Question 153899This question is from textbook
: concrete mix
A builder makes a certain type of concrete by mixing together 1 part portland cement (made from line and clay),3 parts sand ,and 5 parts crushed stone(by volume).If 765 ft^3 of concrete are needed ,how many cubic feet of each ingredient does he need?
iam trying to learn how to master worded problems, but i am faced with a lot of obstacles.However i would appreciate it very much if you could help me solve this problem.Thank you
This question is from textbook
Answer by dolly(163)   (Show Source):
You can put this solution on YOUR website! Hi,
The ratio of cement, sand and crushed stone = 1 : 3 : 5
==> x cu ft of cement is added to 3x cu ft of sand and mixed with 5x cu ft of stone to get the required volume of concrete.
Volume of concrete needed = 765 cu.ft
==> x + 3x + 5x = 765
==> 9x = 765
==> x = 765/9
==> x = 85
Thus volume of cement to be mixed = 85 cu ft
Volume of sand to be mixed = 3*85 = 255 cu ft
Volume of stone to be mixed = 5*85 = 425 cu ft
Good luck!!!!
Dolly
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