115k views
5 votes
of 24 Step 1 of 1 A theater can seat 300 people. The number of rows is 5 less than the number of seats in each row. How many rows of seats are there?

1 Answer

7 votes

Answer:

Let's use algebra to solve this problem. Let "x" represent the number of seats in each row. According to the information given, the number of rows is 5 less than the number of seats in each row, so the number of rows can be represented as "x - 5."

Since the theater can seat 300 people, we can set up the equation:

Number of rows (x - 5) multiplied by Number of seats in each row (x) = 300

Now, we can solve for x:

(x - 5) * x = 300

x^2 - 5x = 300

Now, let's rearrange the equation:

x^2 - 5x - 300 = 0

We have a quadratic equation. To solve for x, you can use the quadratic formula:

x = (-b ± √(b² - 4ac)) / (2a)

In this equation, a = 1, b = -5, and c = -300. Plugging in these values, we get:

x = (5 ± √((-5)² - 4 * 1 * (-300))) / (2 * 1)

x = (5 ± √(25 + 1200)) / 2

x = (5 ± √1225) / 2

x = (5 ± 35) / 2

Now, we have two possible solutions:

1. x = (5 + 35) / 2 = 40 / 2 = 20

2. x = (5 - 35) / 2 = -30 / 2 = -15

Since the number of seats in each row cannot be negative, we take the positive solution:

x = 20

So, there are 20 seats in each row, and the number of rows is:

Number of rows = x - 5 = 20 - 5 = 15

There are 15 rows of seats in the theater.

User DrDirk
by
7.5k points

No related questions found