Question

ручка,ластик,линейка и закладка стоят вместе 20 рублей.Ручка,линейка и ластик стоят вместе 17 рублей.Закладка,ластик и линейка стоят вместе 12 рублей.Ластик дороже линейки на 1 рубль.Сколько стоит каждая вещь?

Answer 1

20-17=3 руб. стоит закладка
20-12=8 руб. стоит ручка
3+8=11 руб. ручка и закладка вместе
20-11=9 руб. стоимость ластика и линейки
так как ластик дороже линейки на1рубль отсюда следует, что ластик стоит 5 рублей, а линейка 4рубля
ручка-8р., закладка-3р., ластик-5р., линейка-4р.

Answer 2

Закладка-3 рубля
ластик-5 рублей
линейка-4 рубля
ручка-8 рублей

Answer 3

Given Information:

- The pen, eraser, ruler, and bookmark together cost 20 rubles. - The pen, ruler, and eraser together cost 17 rubles. - The bookmark, eraser, and ruler together cost 12 rubles. - The eraser is 1 ruble more expensive than the ruler.

Solution:

Let's assign variables to the cost of each item: - Let p be the cost of the pen. - Let e be the cost of the eraser. - Let r be the cost of the ruler. - Let b be the cost of the bookmark.

Based on the given information, we can form the following equations:

1. The pen, eraser, ruler, and bookmark together cost 20 rubles: - p + e + r + b = 20 2. The pen, ruler, and eraser together cost 17 rubles: - p + r + e = 17 3. The bookmark, eraser, and ruler together cost 12 rubles: - b + e + r = 12 4. The eraser is 1 ruble more expensive than the ruler: - e = r + 1

To solve this system of equations, we can use substitution or elimination method. Let's use the substitution method:

From equation 4, we can substitute the value of e in equations 1, 2, and 3:

- Substituting e = r + 1 in equation 1: - p + (r + 1) + r + b = 20 - p + 2r + b = 19 - Substituting e = r + 1 in equation 2: - p + r + (r + 1) = 17 - p + 2r = 16 - Substituting e = r + 1 in equation 3: - b + (r + 1) + r = 12 - b + 2r = 11 Now we have a system of three equations with three variables: equations 2, 3, and 4.

To solve this system, we can subtract equation 3 from equation 2 to eliminate p:

- (p + 2r) - (p + 2r) = 16 - 19 - 0 = -3 - This equation is not possible.

Therefore, there is no solution that satisfies all the given conditions. The given information is inconsistent.

Please let me know if there's anything else I can help you with!