Heating plant

Workers dump imported coke at the heating plant. They used half of the amount on the first day. On the second day, three-quarters of the rest, and on the third day, left 120 tons. How much coke did they dump at the heating plant?

Final Answer:

x =  960 t

Step-by-step explanation:

$$\begin{gathered} x-\frac{1}{2}x-\frac{3}{4}\cdot (x-\frac{1}{2}x)=120 \\ x-1/2\cdot x-3/4\cdot (x-1/2\cdot x)=120 \\ 0.5x=480 \\ x=\frac{480}{0.5}=960 \\ x=960=960\text{t} \end{gathered}$$

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