100 passengers go by three cars of the train. In the first and second cars together 66 passengers, and in the second and third cars of 69 passengers. How many passengers in each car? A task with an explanation!

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1) 100-66=34 (o) go by the third car. 2) 69-34=35 (o) go by the second car. 3) 66-35=31(ch) in the first car. Answer: 31, 35 and 34 passengers. Let x - the number of passengers in the first car, then (66th) the number of passengers here the second car, and 69-(66th) in the third. Let's work out the equation: x + (66th) + 69-(66th) = 100 x + 66 - x + 69 - 66 + x = 100 x = 100 - 69 x = 31 - in the first car 66-31=35 - in the second car 69-35=34 - in the third the car
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