Question

У Мальвины Буратино 21 груша.Когда Мальвина отдала Буратино 2 грушы ,у неё осталось в 2 раза больше груш ,чем стало у Буратино.Сколько груш было у Буратино и Мальвины первоначально?

Answer 1

5 у буратино и 16 у мальвины

Answer 2

Пусть x груш у Мальвины и y у Буратино, тогда:





 
Подставим первое уравнение во второе:

21-y-2=2y+4
-3y=-15
y=5 (груш) - у Буратино

Тогда 21-5=16 груш у Мальвины

Ответ: 5 груш у Буратино и 16 груш у Мальвины

Answer 3

This is a math problem that can be solved by using a system of equations. Let x be the number of pears that Buratino had initially, and y be the number of pears that Malvina had initially. Then, we can write the following equations:

x + y = 21 (the total number of pears is 21) y - 2 = 2(x + 2) (after Malvina gave 2 pears to Buratino, she had twice as many pears as he had)

To solve this system, we can substitute y = 21 - x into the second equation and get:

21 - x - 2 = 2(x + 2) Simplifying and rearranging, we get:

3x = 15 x = 5

Therefore, Buratino had 5 pears initially, and Malvina had 21 - 5 = 16 pears initially. This is the answer.

You can also find some online solutions to this problem by using the web search tool that I have access to. Here are some of the results that I found:

- [A detailed explanation with steps and diagrams](https://online-otvet.ru/matematika/5cea8a4896f4e19a2929bc65) - [A short answer with the same method as mine](https://online-otvet.ru/matematika/5cea969e96f4e19a2944c994) - [Another answer with a different method using fractions](https://uchi.ru/otvety/questions/u-malvini-i-buratino-21-grusha-kogda-malvina-otdala-2-grushi-buratino-u-nee-ostalos-v-2-r)