Question

В магазин привезли арбузы. До обеда магазин продал 2/5, после обеда- 1/3 привезенных ар. осталось продать 80 ар. Сколько ар привезли???

Answer 1

1 - 0.4 - 1/3 = 4/15 - осталось арбузов.
80:4*15 = 300 арбузов.
Ответ: 300 арбузов

Answer 2

Calculation of the Number of Watermelons

To calculate the number of watermelons that were brought to the store, we can follow the information provided in the question.

According to the question, 2/5 of the watermelons were sold before lunch, and 1/3 of the remaining watermelons were sold after lunch. The remaining watermelons to be sold after lunch were 80.

Let's calculate the number of watermelons that were brought to the store step by step:

1. Calculate the number of watermelons sold before lunch: - 2/5 of the watermelons were sold before lunch. - Let's represent the total number of watermelons as x. - The number of watermelons sold before lunch is 2/5 * x.

2. Calculate the number of watermelons remaining after lunch: - After lunch, 1/3 of the remaining watermelons were sold. - The remaining watermelons after lunch can be calculated as (1 - 1/3) * (x - 2/5 * x).

3. Set up an equation to solve for the total number of watermelons: - The remaining watermelons after lunch is equal to 80. - So, we have the equation (1 - 1/3) * (x - 2/5 * x) = 80.

Let's solve the equation to find the total number of watermelons:

(1 - 1/3) * (x - 2/5 * x) = 80
(2/3) * (3/5 * x) = 80
(2/3) * (3/5) * x = 80
(2/5) * x = 80
x = 80 * (5/2)
x = 200

Therefore, the total number of watermelons brought to the store is 200.

Answer: 200 watermelons were brought to the store.