If 5 workers can collect 60 kg wheat in 3 days, how many kilograms of wheat will 8 workers collect in 5 days ?

Answer: Option D

Let the required quantity be x kg.
More workers, More quantity (Direct proportion)
More days, More quantity (Direct proportion)
$$\begin{array}{c}\text{Workers 5}:8\text{hfill}\\ \text{Days 3}:5\text{hfill}\end{array}\}::60:x$$
$$\begin{array}{rl}& \therefore 5\times 3\times x=8\times 5\times 60\\ & \iff x=\frac{\left(8\times 5\times 60\right)}{\left(5\times 3\right)}\\ & \iff x=160\end{array}$$