Question

Обозначьте неизвестную величину буквой и составьте разные пропорции по условию задачи а) Таня занимается рассылкой объявлений. Она запечатывает 100 конвертов за 16 мин. Сколько конвертов запечатает она за 40 мин, если будет работать с такой же скоростью? б)Ольга может за 30 секунд может набрать на компьютере 160 знаков. Сколько знаков она наберет за пять минут, если будет работать с такой же скоростью ?

Answer 1

16-100
40-?                    100/16*40/16=250конвертов
 
30-160
300-?                  160/30*300/30=1600знаков
вроде так=)

Answer 2

Task a)

To solve this problem, let's denote the unknown quantity as x, which represents the number of envelopes Tanya will seal in 40 minutes.

We can set up a proportion using the given information: Tanya seals 100 envelopes in 16 minutes. This can be expressed as:

100 envelopes / 16 minutes = x envelopes / 40 minutes

To find the value of x, we can cross-multiply and solve for it:

100 * 40 = 16 * x

Simplifying the equation:

4000 = 16x

Dividing both sides by 16:

x = 4000 / 16

Calculating the value of x:

x = 250

Therefore, Tanya will seal 250 envelopes in 40 minutes if she works at the same speed.

Task b)

Let's denote the unknown quantity as y, which represents the number of characters Olga will type in five minutes.

We are given that Olga can type 160 characters in 30 seconds. We can set up a proportion using this information:

160 characters / 30 seconds = y characters / 5 minutes

To find the value of y, we can cross-multiply and solve for it:

160 * 5 = 30 * y

Simplifying the equation:

800 = 30y

Dividing both sides by 30:

y = 800 / 30

Calculating the value of y:

y = 26.67

Therefore, Olga will type approximately 26.67 characters in five minutes if she works at the same speed.