Question

Мальчик хочет купить машинки (все стоят одинаково). Если он купит 7 машинок, то у него останется 100 руб. а до покупки 9 машинок не хватает 20 руб. Ск. стоит 1 машинка?

Answer 1

Пошаговое объяснение:

Одна машина стоит 60 руб.

Answer 2

Calculation of the Cost of One Toy Car

To determine the cost of one toy car, let's analyze the given information:

- The boy wants to buy 7 toy cars, and after the purchase, he will have 100 rubles left. - If he had 20 rubles more, he would be able to buy 9 toy cars.

Let's set up an equation to solve for the cost of one toy car:

Let x be the cost of one toy car.

According to the given information, we can write the following equations:

Equation 1: 7x + 100 = total amount spent on 7 toy cars Equation 2: 9x - 20 = total amount needed to buy 9 toy cars

To find the cost of one toy car, we need to solve these equations simultaneously.

Solving the Equations

Let's solve the equations using a system of equations:

Equation 1: 7x + 100 = total amount spent on 7 toy cars Equation 2: 9x - 20 = total amount needed to buy 9 toy cars

Subtracting Equation 1 from Equation 2, we get:

(9x - 20) - (7x + 100) = 0 2x - 120 = 0 2x = 120 x = 60

Therefore, the cost of one toy car is 60 rubles.

Conclusion

The cost of one toy car is 60 rubles.