## 181. Math Puzzle $6 / 80$

A gasoline car consumes 10.5 l of gasoline per $100 \mathrm{~km}$. It is known that the energy efficiency of a gasoline engine is 24 percent, while that of a diesel engine is 38 percent.

How much fuel would the car consume if it were powered by a diesel engine of the same performance and driving style?
The fuel consumption of a diesel engine is obviously lower than that of an Otto engine. Therefore, the task can be solved with an inverse proportion:

$$
10.5: x=38: 24, \quad 38 x=10.5 \cdot 24, \quad x=6.6
$$

The car would consume only 6.6 l of fuel per $100 \mathrm{~km}$ with a diesel engine.