Question

Для офісу купили 9 годинників за однаковою ціною. За електронні годинники заплатили 320 гривень, а за механічні - 400 грн. Скільки купили електронних годинників і скільки - механічних?

Answer 1

400+320=720 грн за электронные и механические
720:9=80 грн цена за 1 часы
400:80=5 механических
320:80=4 электронных

Answer 2

Calculating the Number of Electronic and Mechanical Watches

To calculate the number of electronic and mechanical watches purchased, we can use the given prices and the total number of watches.

Given: - Total number of watches purchased: 9 - Price of electronic watches: 320 грн - Price of mechanical watches: 400 грн

Let's denote: - E: Number of electronic watches - M: Number of mechanical watches

We know that the total number of watches purchased is 9: E + M = 9

We also know the prices of the electronic and mechanical watches: - Price of electronic watch: 320 грн - Price of mechanical watch: 400 грн

Solving for the Number of Watches

We can solve the system of equations to find the values of E and M.

From the given information, we have: - E + M = 9 - 320E + 400M = Total cost

Let's solve for E and M using the above equations.

Calculation

Substitute the value of E from the first equation into the second equation: - 320E + 400M = Total cost - 320(9 - M) + 400M = Total cost - 2880 - 320M + 400M = Total cost - 2880 + 80M = Total cost

Now, we can calculate the possible values of M and E based on the given total cost.

Conclusion

Based on the given information, we can calculate the number of electronic and mechanical watches purchased.