Question

Лена купила 3м белой тесьми и 20дм черной. сколько всего тесьми купила Лена.

Answer 1

3 метра = 30 дециметрам
30 (децим. белой) + 20 (децим. черной) = 50 (децим. тесьмы)всего
                                    или 
20 децим. = 2 метрам
3 (м. белой) + 2 (м. черной) = 5 (м. тесьмы) всего

Answer 2

3м =30 дц
30+20=50 дц или 5 м тесьмы всего купила Лена

Answer 3

Calculation of the Total Amount of Ribbon Purchased by Lena

To calculate the total amount of ribbon purchased by Lena, we need to add the lengths of the two types of ribbon she bought: 3 meters of white ribbon and 20 decimeters (dm) of black ribbon.

1 meter is equal to 10 decimeters, so we can convert the 20 decimeters of black ribbon to meters by dividing it by 10. This gives us 2 meters of black ribbon.

Therefore, Lena purchased a total of 3 meters of white ribbon and 2 meters of black ribbon.

Let's summarize the calculation:

- White ribbon: 3 meters - Black ribbon: 2 meters

Thus, Lena purchased a total of 5 meters of ribbon.