Question

Пете надо купить три учебника химия биология английский химия в два раза больше чем биология и на 42 руб. меньше чем английский сколько рублей стоит каждый учебник если на все три учебника у него уйдет 250руб

Answer 1

Химия: 2х
Биология: х
Английский: 2х+42
2х+х+2х+42=250
5х=208 (:5)
х=41,6
Биология: 41,6
Химия: 41,6*2=83,2
Английский: 83,2+42=125,2

Answer 2

Problem Analysis

Pete needs to buy three textbooks: Chemistry, Biology, and English. The price of Chemistry is twice the price of Biology, and the price of Chemistry is 42 rubles less than the price of English. Pete has a total budget of 250 rubles for all three textbooks. We need to determine the price of each textbook.

Solution

Let's assume the price of Biology is x rubles.

According to the given information: - The price of Chemistry is twice the price of Biology, so the price of Chemistry is 2x rubles. - The price of Chemistry is 42 rubles less than the price of English, so the price of English is (2x + 42) rubles.

Pete's total budget is 250 rubles, so we can set up the following equation:

x + 2x + (2x + 42) = 250

Simplifying the equation:

5x + 42 = 250

Subtracting 42 from both sides:

5x = 208

Dividing both sides by 5:

x = 41.6

Since the price of a textbook cannot be in fractional rubles, we can round up to the nearest whole number. Therefore, the price of Biology is 42 rubles.

Using this information, we can calculate the prices of Chemistry and English:

- The price of Chemistry is twice the price of Biology, so it is 2 * 42 = 84 rubles. - The price of English is 42 rubles more than the price of Chemistry, so it is 84 + 42 = 126 rubles.

Therefore, the price of each textbook is as follows: - Biology: 42 rubles - Chemistry: 84 rubles - English: 126 rubles.

Answer

The price of each textbook is as follows: - Biology: 42 rubles - Chemistry: 84 rubles - English: 126 rubles.