Question

Я задумал число,увеличел его в 15 раз,а потом уменшила на 30%.в результате получила число равно 1/3 части от числа 189 .Какое число я задумал?

Answer 1

Чтобы найти задуманное число,нужно сделать все действия в обратном порядке.

Начинаем:

1/3 от 189 = 63.
63*0.7=90
90:15=6
Ответ: 6.

Answer 2

Problem Analysis

The problem states that a number was initially chosen, then increased by 15 times, and finally decreased by 30%. The result is equal to one-third of the number 189. We need to find the original number that was chosen.

Solution

Let's assume the original number chosen is x.

According to the problem, the number was increased by 15 times, so the new number is 15 times the original number: 15x.

Then, the new number was decreased by 30%, which can be calculated as 70% of the new number: 0.7 * 15x.

The result is equal to one-third of the number 189, which can be expressed as: (1/3) * 189.

Now we can set up an equation to solve for x:

0.7 * 15x = (1/3) * 189

To solve this equation, we can divide both sides by 0.7 and then divide by 15:

x = (1/3) * 189 / (0.7 * 15)

Let's calculate the value of x using this equation.

Calculation

Using the equation x = (1/3) * 189 / (0.7 * 15), we can calculate the value of x.

x = (1/3) * 189 / (0.7 * 15) = 9

Therefore, the original number that was chosen is 9.

Answer

The number you initially chose is 9.