SOLUTION: a given type of concrete contains twice as much sand as cement and 1.5 times as much gravel as sand.how many cubic yards of each must be used to make 9 yd3 of concrete? assume no

Question 723060: a given type of concrete contains twice as much sand as cement and 1.5
times as much gravel as sand.how many cubic yards of each must be used to make 9 yd3 of concrete? assume no loss of volume in mixing.
Answer by josgarithmetic(39625) (Show Source): You can put this solution on YOUR website!
x = amount sand
y = amount cement
z = amount gravel
x/y=2. This means x=2y. Also, means y/x=1/2, so .
z/x=1.5. This means .

Want 9 yd^3 of concrete.
.
Using the above substitutions allows to express everything in terms of just x.

...continue from here to solve and finish for x, y, and z.
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