SOLUTION: A 2:3 concrete mix means that for every two parts of sand , three parts of gravel are used. How much sand should be used in a mix composed of 25 cubic feet of gravel?
Algebra ->
Percentage-and-ratio-word-problems
-> SOLUTION: A 2:3 concrete mix means that for every two parts of sand , three parts of gravel are used. How much sand should be used in a mix composed of 25 cubic feet of gravel?
Log On
Question 218851: A 2:3 concrete mix means that for every two parts of sand , three parts of gravel are used. How much sand should be used in a mix composed of 25 cubic feet of gravel? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! A 2:3 concrete mix means that for every two parts of sand , three parts of gravel are used. How much sand should be used in a mix composed of 25 cubic feet of gravel?
--------------------
2:3 is the same as 2x:3x where 2x is the sand and 3x is the gravel.
--------------------
Equation:
2x + 3x = 25 ft^3
5x = 25
x = 5 ft^3
------------------
sand = 2x = 10 ft^3
==========================
Cheers,
Stan H.
(