Question

Несколько учеников пошли в кино. Если собрать с каждого ученика по 2 рубля за билет, то для покупки билетов не хватает 5 рублей, а если собрать по 2 руб 70 копю, то остается 2 рубля. Сколько было учеников?

Answer 1

Пусть x - количество учеников. Тогда количество рублей на билет с одной стороны равно 2x+5, а с другой - 2,7x-2. Приравняем эти значения
2x+5=2,7x-2
0,7x=7
x=10.
значит человек было десять

Answer 2

Calculating the Number of Students

To solve this problem, we can set up a system of equations based on the given information.

Let's assume the number of students is represented by x.

1. If each student contributes 2 rubles for the tickets, there is a shortfall of 5 rubles: - Equation 1: 2x - 5 = total cost of tickets

2. If each student contributes 2 rubles and 70 kopecks for the tickets, there is a surplus of 2 rubles: - Equation 2: (2.7)x - 2 = total cost of tickets

We can now solve these equations to find the value of x.

Solving the Equations

First, let's solve Equation 1: - 2x - 5 = total cost of tickets - The total cost of tickets can be represented as 2x - 5

Next, let's solve Equation 2: - (2.7)x - 2 = total cost of tickets - The total cost of tickets can be represented as (2.7)x - 2

Now, we can set these two expressions equal to each other: - 2x - 5 = (2.7)x - 2

Solving for x: - 2x - (2.7)x = -2 + 5 - -0.7x = 3 - x = 3 / -0.7 - x ≈ -4.2857

Since the number of students cannot be negative, there seems to be an issue with the given information or the calculations. It's possible that there is a mistake in the provided problem. If you have additional information or if there might be a typo, please provide it so that we can accurately solve the problem.