Question

Какие суммы можно набрать, используя только двухрублевые и пятирублевые монеты так, чтобы число использованных монет было четным? Варианты: 11 рублей, 15 рублей,18 рублей, 24 рубля?

Answer 1

Подходят только 24,11,15

Answer 2

11,24,15 и всё больше ничего

Answer 3

Solving for the Possible Sums Using Two-Ruble and Five-Ruble Coins

To find the possible sums that can be obtained using only two-ruble and five-ruble coins, where the number of coins used is even, we can consider the following approach:

1. Identify the Possible Sums: - We need to find the sums that can be formed using only two-ruble and five-ruble coins, where the number of coins used is even. 2. Consider the Combinations: - We can consider different combinations of two-ruble and five-ruble coins to find the possible sums.

3. Calculate the Sums: - By calculating the sums using various combinations of two-ruble and five-ruble coins, we can determine the possible amounts that can be obtained.

Possible Sums Using Two-Ruble and Five-Ruble Coins

After considering the combinations of two-ruble and five-ruble coins, the possible sums that can be obtained, where the number of coins used is even, are as follows:

- 11 rubles - This sum can be obtained using four two-ruble coins and one five-ruble coin.

- 15 rubles - This sum can be obtained using three two-ruble coins and three five-ruble coins.

- 18 rubles - This sum can be obtained using six two-ruble coins and no five-ruble coins.

- 24 rubles - This sum can be obtained using eight two-ruble coins and no five-ruble coins.

Conclusion

The possible sums that can be obtained using only two-ruble and five-ruble coins, where the number of coins used is even, are 11 rubles, 15 rubles, 18 rubles, and 24 rubles.