Question

В некотором царстве, в некотором государстве пятиклас¬сники стали изучать математику не 7, а 5 уроков в неделю. Кроме того, урок у них стал длиться не 45, а 50 минут. Сколько процентов учебного времени потеряли пятиклассники? Ответ округлите до сотых.

Answer 1

Відповідь:

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Покрокове пояснення:

Answer 2

Calculation of Lost Instructional Time

To calculate the percentage of instructional time lost by the fifth graders, we need to compare the number of lessons and the duration of each lesson before and after the changes.

Before the changes: - Number of math lessons per week: 7 - Duration of each math lesson: 45 minutes

After the changes: - Number of math lessons per week: 5 - Duration of each math lesson: 50 minutes

To calculate the lost instructional time, we can use the following formula:

Lost Instructional Time = (Old Time - New Time) * Number of Lessons

Let's calculate the lost instructional time step by step:

1. Calculate the old time per week: - Old Time = Number of Lessons * Duration of each Lesson - Old Time = 7 * 45 minutes = 315 minutes

2. Calculate the new time per week: - New Time = Number of Lessons * Duration of each Lesson - New Time = 5 * 50 minutes = 250 minutes

3. Calculate the lost instructional time: - Lost Instructional Time = Old Time - New Time - Lost Instructional Time = 315 minutes - 250 minutes = 65 minutes

4. Calculate the percentage of lost instructional time: - Percentage of Lost Instructional Time = (Lost Instructional Time / Old Time) * 100 - Percentage of Lost Instructional Time = (65 minutes / 315 minutes) * 100 ≈ 20.63%

Therefore, the fifth graders have lost approximately 20.63% of their instructional time due to the changes in the number of lessons and the duration of each lesson.