Question

Шоколад стоит 3 рубля, а мороженное стоит 2 рубля 50 копеек. Всего они стоят 13 рублей 50 копеек. Сколько штук купили мороженого и шоколада?

Answer 1

Неправильно нет нет и нет 5 шоколадок и 1 мороженное

Answer 2

Решал методом подбора:
3 мороженных и 2 шоколадки

Answer 3

Problem Analysis

To solve this problem, we need to determine the number of chocolates and ice creams that were purchased given their respective prices and the total cost.

Solution

Let's assume the number of chocolates purchased is x and the number of ice creams purchased is y.

According to the given information, the cost of one chocolate is 3 rubles and the cost of one ice cream is 2 rubles and 50 kopeks (or 0.50 rubles). The total cost of the chocolates and ice creams is 13 rubles and 50 kopeks (or 13.50 rubles).

We can set up the following equation to represent the total cost:

3x + 2.50y = 13.50 .

To solve this equation, we can use substitution or elimination method. Let's use the substitution method.

From the equation above, we can isolate one variable and express it in terms of the other variable. Let's solve for x:

3x = 13.50 - 2.50y.

Now, we can substitute this expression for x into the equation 3x + 2.50y = 13.50:

3(13.50 - 2.50y) + 2.50y = 13.50.

Simplifying the equation:

40.50 - 7.50y + 2.50y = 13.50.

Combining like terms:

-5y = -27.

Dividing both sides by -5:

y = 5.40.

Now that we have the value of y, we can substitute it back into the equation 3x + 2.50y = 13.50 to solve for x:

3x + 2.50(5.40) = 13.50.

Simplifying the equation:

3x + 13.50 = 13.50.

Subtracting 13.50 from both sides:

3x = 0.

Dividing both sides by 3:

x = 0.

Therefore, the number of chocolates purchased (x) is 0, and the number of ice creams purchased (y) is 5.

Answer

Based on the given information, it can be determined that 0 chocolates and 5 ice creams were purchased.

References

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