Question

concrete can be made by mixing cement, sand and gravel in the ratio 3: 6: 8 How much gravel is needed to make 850 m^3 of concrete.

Answer 1

The given ratio is 3:6:8 referring to cement, sand, and gravel, respectively.

Based on the given information, we can express the following

`3x+6x+8x=850`

Now, we solve for x

`\begin{gathered} 17x=850 \\ x=(850)/(17) \\ x=50 \end{gathered}`

Now, we find the gravel using the ratio

`8x=8\cdot50=400`Hence, they needed 400 cubic meters of gravel.