To find out how much you earn for washing 2 cars, first calculate how much you earn per car.
You earn $25 for washing 5 cars. So, the earnings per car can be calculated as follows:
\[ \text{Earnings per car} = \frac{25}{5} = 5 \text{ dollars per car} \]
Now, to find out how much you earn for washing 2 cars, multiply the earnings per car by the number of cars:
\[ \text{Earnings for 2 cars} = 2 \times 5 = 10 \text{ dollars} \]
Therefore, you earn $10 for washing 2 cars.