Question

Три ученика за 5 дней прочитали 285 страниц книги за сколько дней один ученик прочитает 76 страниц три класса за 4 дня решают 96 задач сколько задач решает один класс за 7 дней три коровы за 7 дней выпивают 588 л воды за сколько дней выпивает одна корова 140 л воды

Answer 1

1. 285:5 = 57 (с/дн) -производительность ТРЕХ учеников
2. 57:3 = 19 (с/дн) - производительность ОДНОГО ученика
3. 76:19 = 4 (дн) - 1 ученик прочитает 76 страниц

Все остальные решаются аналогично :)

Answer 2

Problem Analysis

To solve this problem, we need to determine the rate at which each student reads and the rate at which each class solves problems or drinks water. We can then use these rates to calculate how long it takes for one student to read a certain number of pages, one class to solve a certain number of problems, or one cow to drink a certain amount of water.

Let's break down the given information and solve each part step by step.

Reading Pages

We are given that three students read 285 pages in 5 days. We need to find out how many pages one student can read in a certain number of days.

Let's calculate the rate at which the three students read pages per day:

Rate of reading for three students = Total pages read / Total number of days = 285 / 5 = 57 pages per day.

Now, we can calculate how many pages one student can read in a certain number of days. Let's say we want to find out how many pages one student can read in 76 days:

Number of pages one student can read in 76 days = Rate of reading for three students * Number of days / Number of students = 57 * 76 / 3 = 1524 pages.

Therefore, one student can read 1524 pages in 76 days.

Solving Problems

We are given that three classes solve 96 problems in 4 days. We need to find out how many problems one class can solve in a certain number of days.

Let's calculate the rate at which the three classes solve problems per day:

Rate of solving problems for three classes = Total number of problems solved / Total number of days = 96 / 4 = 24 problems per day.

Now, we can calculate how many problems one class can solve in a certain number of days. Let's say we want to find out how many problems one class can solve in 7 days:

Number of problems one class can solve in 7 days = Rate of solving problems for three classes * Number of days / Number of classes = 24 * 7 / 3 = 56 problems.

Therefore, one class can solve 56 problems in 7 days.

Drinking Water

We are given that three cows drink 588 liters of water in 7 days. We need to find out how much water one cow can drink in a certain number of days.

Let's calculate the rate at which the three cows drink water per day:

Rate of drinking water for three cows = Total liters of water drunk / Total number of days = 588 / 7 = 84 liters per day.

Now, we can calculate how much water one cow can drink in a certain number of days. Let's say we want to find out how much water one cow can drink in 140 days:

Amount of water one cow can drink in 140 days = Rate of drinking water for three cows * Number of days / Number of cows = 84 * 140 / 3 = 3920 liters.

Therefore, one cow can drink 3920 liters of water in 140 days.

Summary

To summarize the calculations:

- One student can read 1524 pages in 76 days. - One class can solve 56 problems in 7 days. - One cow can drink 3920 liters of water in 140 days.

I hope this helps! Let me know if you have any further questions.