Locomotive

The whole loaded train weighs 760 tons. It has twenty wagons, each carrying 20 tons of grain and empty weighs 10 tons. How much weight a locomotive?

Correct answer:

x =  160 t

Step-by-step explanation:

$$\begin{gathered} a=20+10=30\text{ t } \\ x=760-20\cdot a=760-20\cdot 30=160\text{ t} \end{gathered}$$

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