Question

Надо решать без Х.Витя и Костя решали задачи.Костя решил в три раза больше задач,чем Витя,а Витя на 18 задач меньше ,чем Костя.Сколько задач решил каждый из мальчиков?

Answer 1

---------    Витя  ( 1 часть)
---------    -----------    -----------  Костя  (1 * 3 = 3 части)
              ______18_______

Решение:

18 : 2 = 9 задач решил Витя ( 1 часть)
9 * 3 = 27 задач решил Костя

Ответ: 9; 27.

Answer 2

Problem Analysis

We are given that two boys, Kostya and Vitya, are solving math problems. Kostya solves three times as many problems as Vitya, and Vitya solves 18 fewer problems than Kostya. We need to determine how many problems each boy solved.

Solution

Let's assume that Vitya solved x problems. According to the given information, Kostya solved three times as many problems as Vitya, so Kostya solved 3x problems. Additionally, we know that Vitya solved 18 fewer problems than Kostya, so we can set up the equation:

3x - 18 = x

Simplifying the equation, we get:

2x = 18

Dividing both sides of the equation by 2, we find:

x = 9

Therefore, Vitya solved 9 problems, and Kostya solved three times as many, which is 3 * 9 = 27 problems.

So, Vitya solved 9 problems, and Kostya solved 27 problems.

Answer

Vitya solved 9 problems, and Kostya solved 27 problems.