Question

В актовом зале находятся несколько человек. После того, как в него вошли 8 человек, а 7 вышли, в зале стало 99 человек. Сколько людей было в зале первоначально? (напишите решение)

Answer 1

Количество человек увеличилось на одного и стало 99, следовательно ранее было 98
x+8-7=99
x=99-1
x=98

Answer 2

Problem Analysis

We are given the following information: - There are several people in a hall. - After 8 people enter the hall and 7 people leave, there are 99 people in the hall.

We need to determine the initial number of people in the hall.

Solution

Let's assume the initial number of people in the hall is x.

According to the given information, after 8 people enter the hall and 7 people leave, there are 99 people in the hall. This can be represented by the equation:

x + 8 - 7 = 99

Simplifying the equation, we have:

x + 1 = 99

Subtracting 1 from both sides of the equation, we get:

x = 99 - 1

Therefore, the initial number of people in the hall was 98.

Answer

The initial number of people in the hall was 98.