1.1. Businessmen Ivanov, Petrov, and Sidorov decided to create an automobile enterprise. Ivanov bought 70 identical cars for the enterprise, Petrov - 40 such cars, and Sidorov contributed 44 million rubles to the enterprise. It is known that Ivanov and Petrov can divide this money between themselves so that the contribution of each of the three businessmen to the common cause will be the same. How much money is due to Ivanov? Answer in millions of rubles.
Answer: 40. Solution. Method 1. Each of the businessmen should contribute as much as Sidorov, that is, 44 million rubles. If the car costs $x$, then $\frac{70 x+40 x}{3}=44, x=1.2$. It turns out that Ivanov contributed $70 \cdot 1.2=84$ million rubles, so he should get back $84-44=40$ million rubles. Petrov contributed $40 \cdot 1.2=48$ million rubles, so he should get back $48-44=4$ million rubles.

Method 2. Each of the businessmen should contribute as much as Sidorov, that is, 44 million rubles. If Ivanov takes $t$ million rubles, then Petrov will be left with ( $44-t$ ) million rubles. Therefore, $70 x-t=44$ and $40 x-(44-t)=44$ (here $x$ is the price of the car). Solving this system, we get $x=1.2$ and $t=40$.