Question

ПетяпридумалдляВаситакуюзадачу: «Есликчислуприбавитьсначала345, потомприбавить37, апослеэтоговычесть504, тополучится396. Какоеэточисло? » ПомогиВасенайтиответ. 2 задание.Восемь бегунов бежали в одном забеге и финишировали, отставая на секунду друг от друга. Какой результат показал последний бегун, если первый пробежал дистанцию за 20 секунд? пожалуйста срочно надозаранее спасибо.

Answer 1

504+37+345=886   886-396=390

Answer 2

1.      неизвестное число возьмем за x . (оформление)пусть х -задуманное число ,тогда получаем уравнение х+345+37-504=369 отсюда х=491.

2.      если их было 8 то опираемся на это.значит 1 бегун пробежал 21с,2 -22с,3-23с,4-24с,......и т д.до 8 он пробежал 28с.

Answer 3

Problem 1: Adding and Subtracting Numbers

To solve the first problem, let's break it down step by step.

The problem states that if we start with a number, add 345 to it, then add 37, and finally subtract 504, we end up with the result of 396. We need to find the original number.

Let's represent the original number as "x". We can set up the equation as follows:

x + 345 + 37 - 504 = 396

To find the value of "x", we can simplify the equation by combining like terms:

x - 122 + 37 = 396

Next, we can simplify further:

x - 85 = 396

To isolate "x", we can add 85 to both sides of the equation:

x = 396 + 85

Calculating the right side of the equation:

x = 481

Therefore, the original number is 481.

Problem 2: Running Race Results

In the second problem, we have eight runners who participated in a race. They finished the race with each runner being one second behind the runner in front of them. We need to find the time taken by the last runner if the first runner completed the race in 20 seconds.

Let's analyze the situation. Since each runner finishes one second behind the runner in front of them, we can deduce that the time difference between the first and last runner is 7 seconds (8 runners - 1).

Given that the first runner completed the race in 20 seconds, we can calculate the time taken by the last runner by adding the time difference to the first runner's time:

20 seconds + 7 seconds = 27 seconds

Therefore, the last runner completed the race in 27 seconds.

I hope this helps! Let me know if you have any further questions.