Question

Знайко задумав число,додав до нього 20,відняв34, збільшив на 15 і дістав число 30, Яке число задумав Знайко?

Answer 1

30-15+34-20=29
відповідь: Знайко задумав число 30

Answer 2

Знайко загадав число 30
Перевіряємо: 30-15+34-20=29

Answer 3

Solution to Znayko's Number Puzzle

To solve Znayko's number puzzle, we can work through the given steps to find the original number Znayko had in mind.

1. Znayko thought of a number. 2. Added 20 to it. 3. Subtracted 34 from the result. 4. Increased the result by 15. 5. Finally, arrived at the number 30.

Let's denote the original number Znayko thought of as x.

Step-by-Step Calculation

1. Znayko's number: x 2. After adding 20: x + 20 3. After subtracting 34: (x + 20) - 34 4. After increasing by 15: ((x + 20) - 34) + 15

Equation to Solve

According to the given conditions, we have the equation: ((x + 20) - 34) + 15 = 30

Solving for x

Let's solve for x: ((x + 20) - 34) + 15 = 30 ((x - 14) + 15 = 30 x - 14 + 15 = 30 x + 1 = 30 x = 30 - 1 x = 29

Conclusion

Therefore, the number Znayko originally thought of is 29.