Question

Ученик, готовясь к экзаменам запланировал решать ежедневно 12 заданий. Однако он решал каждый день на 4 задания больше и за 3 дня до экзаменов ему осталось решить 8 заданий. Сколько дней ученик готовился к экзаменам?

Answer 1

Эту задачу решить только так:
х - всего дней
у - всего заданий
Решаем систему:
12х=у
16(х-3)+8=у12х=16х-48+8
16х-12х=40
4х=40
х=10 - дней готовился ученик

Answer 2

Problem Analysis

The student planned to solve 12 problems every day to prepare for the exams. However, he ended up solving 4 more problems each day. Three days before the exams, he had 8 problems left to solve. We need to determine how many days the student prepared for the exams.

Solution

Let's assume that the student prepared for x days.

On each day, the student solved 12 + 4x problems.

Three days before the exams, the student had 8 problems left to solve.

Using this information, we can set up the following equation:

12 + 4x = 8

Now, let's solve for x to find the number of days the student prepared for the exams.

Calculation

Subtracting 12 from both sides of the equation:

4x = 8 - 12

4x = -4

Dividing both sides of the equation by 4:

x = -4 / 4

x = -1

Answer

The calculation shows that the student prepared for -1 days. However, since we cannot have negative days, this means that the student did not have enough time to prepare for the exams based on the given information.