Question

в первый день было продано 2\5 всего масла,а во второй 7\15 остатка,а в третий остаток 64 литра.Сколько было литров масла?

Answer 1

Х  все масло
2/5х  первый день
(х-2/5х)*7/15=21/75х второй день
Х(2/5+21/25)=17/15х первый и второй
х-17/25х=8/25х=64л  третий день
х=64:8/25=200литров

Answer 2

Было всего Х л масла. В первый день осталось Х-2/5X=3/5X.
Во второй день продали 7/15(3/5X)=21/75X масла,
 а значит осталось 3/5X- 21/75X=45/75X-21/75X=24/75X - это 64 л.   
$\frac{24}{75}X=64$
$X=64*\frac{75}{24}=200$
Ответ: 200 л

Answer 3

Calculating the Total Amount of Oil

To calculate the total amount of oil, we can use the information provided about the portions sold on the first, second, and third days.

Step 1: Calculate the amount of oil left after each day's sales. - On the first day, 2/5 of the total oil was sold. - On the second day, 7/15 of the remaining oil was sold. - The remaining amount after the third day's sales is 64 liters.

Step 2: Use the information to calculate the total amount of oil.

Let's calculate the total amount of oil using the given information.

Calculation

- Let's assume the total amount of oil is represented by the variable x.

- On the first day, 2/5 of the total oil was sold, leaving 3/5 of the oil remaining: - Remaining after the first day = x - (2/5)x = (3/5)x.

- On the second day, 7/15 of the remaining oil was sold, leaving 8/15 of the oil remaining: - Remaining after the second day = (3/5)x - (7/15)(3/5)x = (8/15)x.

- The remaining amount after the third day's sales is 64 liters: - (8/15)x = 64 liters.

Solution

- Solving for x: - (8/15)x = 64 - x = 64 * (15/8) - x = 120 liters.

Therefore, the total amount of oil was 120 liters.