Question

In a certain month, Oscar sells 6 cars more than Jackie. If together they sell 30 cars, how many cars did Jackie sell?

Answer 1

12 cars

Explanation:

Let Jackie sold x cars

So, no of cars sold by Oscar = x + 6

According to the given information:

Number of cars sold by Oscar and Jackie together = 30

`\therefore \: (x + 6) + x = 30 \\ 2x + 6 = 30 \\ 2x = 30 - 6 \\ 2x = 24 \\ x = (24)/(2) \\ x = 12`

Hence, Jackie sold 12 cars.

Answer 2

Jackie sold 12 cars.

Explanation:

If we call the number of cars Oscar sold O, and the number of cars Jackie sold J, we can say the following:

O = J + 6

As Oscar sold 6 cars more than Jackie.

Together, they sold 30 cars.

O + J = 30

Since we know that:

O = J + 6

... we can put this into our previous equation.

O + J = 30

(J + 6) + J = 30

J + J + 6 = 30

2 * J + 6 = 30

Subtract 6 from both sides:

2 * J = 24

Divide both sides by 2:

J = 24 / 2

J = 12

Jackie sold 12 cars.