Company car

Ms. Vankova has a company car equipped with a multifunction indicator to monitor the average petrol consumption during individual rides. During the first ride, mostly in city traffic, it traveled 20.5 km, with an average consumption of 7.8L/100km. In the next two trips, mainly outside the city, she drove 115.5 km first, with an average consumption of 6.2L/100 km, then 130 km with an average consumption of 5.8L/100 km. Calculate the total gasoline consumption for all three rides.

Correct answer:

s =  16.3 l

Step-by-step explanation:

$$\begin{gathered} s_1=7.8\cdot \frac{20.5}{100}=1.599\text{l} \\ {s}_2=6.2\cdot \frac{115.5}{100}=7.161\text{l} \\ {s}_3=5.8\cdot \frac{130}{100}=\frac{377}{50}=7.54\text{l} \\ s=s_1+s_2+s_3=1.599+7.161+7.54=\frac{163}{10}\text{l}=16.3\text{l} \end{gathered}$$

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