Question

Пожалуйста срочно помогите решить задачу : К осени цена на картофель понизилась сначала на 25% , а затем еще раз понизилась на 70% , после чего картофель стал стоить 6,3 руб за килограмм . Найдите летнею цену картофеля !

Answer 1

1) 25+70=95(%)
2) 5%=6,3руб.
3)6,3х20= 126(руб.)

Answer 2

6,3 руб-это оставшиеся 30%
100%=6,3*100/30=21 руб
21 руб это 75%
100%=21*100/75=28 руб

Answer 3

Problem Analysis

To solve this problem, we need to find the original price of potatoes before the two price reductions. We are given that the price of potatoes decreased by 25% and then decreased again by 70%. After these reductions, the price of potatoes is 6.3 rubles per kilogram. We need to find the original price of potatoes.

Solution

Let's assume the original price of potatoes is x rubles per kilogram.

The first price reduction of 25% means the price decreased to 75% of the original price: 0.75x rubles per kilogram.

The second price reduction of 70% means the price decreased to 30% of the previous price: 0.3 * 0.75x = 0.225x rubles per kilogram.

According to the problem, the final price of potatoes is 6.3 rubles per kilogram. Therefore, we can set up the equation:

0.225x = 6.3

To find the value of x, we can solve this equation:

x = 6.3 / 0.225

Now, let's calculate the value of x:

x = 6.3 / 0.225 = 28 rubles per kilogram.

Answer

The original price of potatoes before the price reductions was 28 rubles per kilogram.

Note: The search results did not provide direct information for this specific problem. The solution was derived using mathematical calculations based on the given information.