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

$\begin{gathered} 17x=850 \\ x=\frac{850}{17} \\ x=50 \end{gathered}$

Now, we find the gravel using the ratio

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