Question

два карандаша и ластик стоят столько же,сколько один карандаш и четыре ластика.во сколько раз карандаш дороже ластика

Answer 1

Пусть карандаш= х, а ластик= y

2x+y=x+4y
2x-x=4y-y
x=2y

Отв: В 3 раза

Answer 2

Calculating the Price Difference Between a Pencil and an Eraser

To solve this problem, we can use algebra to represent the given information and then solve for the price difference between a pencil and an eraser.

Let's denote: - The cost of one pencil as P - The cost of one eraser as E

According to the given information, two pencils and one eraser cost the same as one pencil and four erasers. This can be represented as the equation: 2P + E = P + 4E

We can simplify this equation to find the relationship between the cost of a pencil and an eraser.

Solving the Equation

Subtracting P from both sides of the equation gives: 2P - P + E = 4E

Simplifying further: P + E = 4E

Subtracting E from both sides: P = 3E

This equation shows that the cost of a pencil is three times the cost of an eraser.

Conclusion

Therefore, the pencil is three times more expensive than the eraser.