Question

Для покраски двери площадью 120 кв.дм.,необходимо 2л. белой краски.Сколько такой же краски потребуется чтобы покрасить два подоконника длиной 1м.2дм и шириной 1 дм. каждый? (без дробей)

Answer 1

Площадь подоконника равна 12дм*1дм=12 кв. дм. что является десятой частью площади двери, а значит расход краски будет равен десятой части от расхода на дверь.
2/10=0,2л.
На один подоконник потребуется 0,2л краски.
На два подоконника потребуется 0,2*2=0,4л краски.

Answer 2

Calculating Paint Needed for Door and Window Sills

To calculate the amount of paint needed for the door and window sills, we can use the given information about the door and then apply it to the window sills.

Given: - Area of the door: 120 sq.dm. - Amount of white paint needed for the door: 2 liters.

Calculating Paint Needed for Window Sills

To calculate the amount of paint needed for the window sills, we can follow these steps:

1. Calculate the Total Area of the Window Sills: - Length of each window sill: 1m 2dm - Width of each window sill: 1 dm

The total area of one window sill can be calculated as: \( \text{Length} \times \text{Width} = 1m\ 2dm \times 1dm = 12 \, sq.dm \)

Since there are two window sills, the total area for both window sills is: \( 12 \, sq.dm \times 2 = 24 \, sq.dm \)

2. Calculate the Amount of Paint Needed for the Window Sills: - We know that 2 liters of white paint are needed for 120 sq.dm. - To find out how much paint is needed for 24 sq.dm, we can set up a proportion:

\( \frac{2 \, liters}{120 \, sq.dm} = \frac{x \, liters}{24 \, sq.dm} \)

Solving for \( x \): \( x = \frac{2 \, liters \times 24 \, sq.dm}{120 \, sq.dm} = 0.4 \, liters \)

Answer

To paint the two window sills, the same amount of white paint needed for the door (120 sq.dm) would be required, which is 0.4 liters.