Question

Петя написал на доске число.Маша уменьшила его на 2.Коля уменьшил Машино число ещё на 3.Потом они сложили три своих числа и получили 2018.Какое число написал Петя? СРОЧНО, ПОЖАЛУЙСТА!​

Answer 1

Петя написал х

Маша х-2

Коля. х-2-3=х-5

сложим

х+(х-2) +(х-5)=2018

3х-7=2018

3х=2025

х= 675

ответ: 675

Answer 2

Problem Analysis

We are given the following information: - Petya wrote a number on the board. - Masha reduced it by 2. - Kolya reduced Masha's number by 3. - The sum of their three numbers is 2018.

We need to find the number that Petya wrote on the board.

Solution

Let's assume the number Petya wrote on the board is x.

According to the given information: - Masha reduced it by 2, so Masha's number is x - 2. - Kolya reduced Masha's number by 3, so Kolya's number is (x - 2) - 3.

The sum of their three numbers is 2018, so we can write the equation: x + (x - 2) + ((x - 2) - 3) = 2018.

Simplifying the equation: 3x - 7 = 2018.

Adding 7 to both sides: 3x = 2025.

Dividing both sides by 3: x = 675.

Therefore, the number that Petya wrote on the board is 675.

Answer

Petya wrote the number 675 on the board.