Question

7 чашек и 12 блюдец стоят 1909,а 12 блюдец и 7 чашек стоят 2119.Сколько стоят 10 таких же чашек и 10 блюдец

Answer 1

1)140+180*12=3кг840г

Answer 2

7ч+12б=1909   12ч+7б=2119 10ч+10б=?   19ч+19б=4028  10ч+10б=4028\1.9=2120

Answer 3

Calculating the Cost of 10 Cups and 10 Saucers

To calculate the cost of 10 cups and 10 saucers, we can use the given information about the prices of 7 cups and 12 saucers and the prices of 12 cups and 7 saucers.

Given: - 7 cups and 12 saucers cost 1909. - 12 cups and 7 saucers cost 2119.

Let's calculate the cost of 10 cups and 10 saucers using the given information.

Calculation

We can set up a system of equations to solve for the cost of 10 cups and 10 saucers.

Let's represent the cost of a cup as C and the cost of a saucer as S.

We have the following equations: 1. 7C + 12S = 1909 2. 12C + 7S = 2119

We can solve this system of equations to find the values of C and S.

Solution

Using the given equations, we can solve for the cost of a cup (C) and the cost of a saucer (S).

Multiplying the first equation by 12 and the second equation by 7, we get: 1. 84C + 144S = 22908 2. 84C + 49S = 14833

Subtracting the second equation from the first, we get: 95S = 8075 S = 85

Substituting the value of S back into the first equation: 7C + 12(85) = 1909 7C + 1020 = 1909 7C = 889 C = 127

So, the cost of a cup (C) is 127 and the cost of a saucer (S) is 85.

Total Cost of 10 Cups and 10 Saucers

Now that we have the individual costs of a cup and a saucer, we can calculate the total cost of 10 cups and 10 saucers.

Total cost = (Cost of 10 cups) + (Cost of 10 saucers) Total cost = (10 * 127) + (10 * 85) Total cost = 1270 + 850 Total cost = 2120

Therefore, the total cost of 10 cups and 10 saucers is 2120.