Question

Ученик задумал число увеличил его в1 целых5/6раза,прибавил 2,3 и получил 7,8 Кокое число он задумал?срочно!!!!!!!!!

Answer 1

Ученик задумал число 3

Answer 2

Problem Analysis

The student thought of a number, increased it by 1 and 5/6 times, added 2.3 to the result, and obtained 7.8. We need to find the original number that the student had in mind.

Solution

Let's break down the problem step by step:

1. The student increased the number by 1 and 5/6 times. 2. Then, the student added 2.3 to the result. 3. The final result is 7.8.

To find the original number, we need to reverse these steps.

Let's denote the original number as x.

Step 1: The student increased the number by 1 and 5/6 times. This can be represented as: x + (5/6)x + 1

Step 2: The student added 2.3 to the result. This can be represented as: (x + (5/6)x + 1) + 2.3

Step 3: The final result is 7.8. This can be represented as: (x + (5/6)x + 1) + 2.3 = 7.8

Now, let's solve this equation to find the value of x.

Calculation

(x + (5/6)x + 1) + 2.3 = 7.8

Simplifying the equation: (11/6)x + 3.3 = 7.8

Subtracting 3.3 from both sides: (11/6)x = 4.5

Multiplying both sides by 6/11 to isolate x: x = (4.5 * 6) / 11

Calculating the value of x: x = 2.45

Therefore, the number the student had in mind is 2.45.

Answer

The student had the number 2.45 in mind.