College

6. At a construction site, cement, sand, and gravel are used to make concrete. The ratio of cement to sand to gravel is 1:2.4:3.6. If a 150-lb bag of sand is used, how much cement and gravel must be used?

Answer :

Answer:

Mass of cement used is 62.5 lb

Mass of gravel used is 225 lb

Explanation:

The ratio given here is cement to sand to gravel = 1 : 2.4 : 3.6

So, for 150 lb of sand

C : S : G = 1 : 2.4 : 3.6

[tex]\frac{C}{S}=\frac{1}{2.4}\\\Rightarrow C=S\frac{1}{2.4}\\\Rightarrow C=150\frac{1}{2.4}\\\Rightarrow C=62.5\ lb[/tex]

Mass of cement used is 62.5 lb

[tex]\frac{S}{G}=\frac{2.4}{3.6}\\\Rightarrow G=S\frac{3.6}{2.4}\\\Rightarrow C=150\frac{3.6}{2.4}\\\Rightarrow C=225\ lb[/tex]

Mass of gravel used is 225 lb

Other Questions