Question

Три друга красили забор вместе.Ваня покрасил 1/3 забора.Костя 4/7.Сколько покрасил Саша?

Answer 1

Если забор был покрашен до конца
то Саша покрасил:
$1 - \frac{1}{3} - \frac{4}{7} = \frac{21 - 7 - 12}{21} = \frac{2}{21}$

Ответ
$\frac{2}{21}$
забора

Answer 2

Problem Statement

Три друга красили забор вместе. Ваня покрасил 1/3 забора. Костя покрасил 4/7. Сколько покрасил Саша?

Solution

To find out how much Sasha painted, we need to subtract the portions painted by Vanya and Kostya from the total length of the fence.

Let's assume the total length of the fence is x.

According to the given information: - Vanya painted 1/3 of the fence. - Kostya painted 4/7 of the fence.

To find out how much Sasha painted, we need to subtract the portions painted by Vanya and Kostya from the total length of the fence.

The portion painted by Vanya is 1/3 of the total length of the fence, which can be represented as (1/3)x.

The portion painted by Kostya is 4/7 of the total length of the fence, which can be represented as (4/7)x.

To find out how much Sasha painted, we subtract the portions painted by Vanya and Kostya from the total length of the fence:

Sasha's portion = Total length - Vanya's portion - Kostya's portion

Sasha's portion = x - (1/3)x - (4/7)x

Simplifying the equation:

Sasha's portion = (21/21)x - (7/21)x - (12/21)x

Sasha's portion = (21 - 7 - 12)/21)x

Sasha's portion = 2/21)x

Therefore, Sasha painted 2/21 of the total length of the fence.

Answer

Sasha painted 2/21 of the total length of the fence.