The perimeter of a rectangular movie screen at a local cinema is 148 feet. If the length of the screen is 30 feet longer than the width, what is the length of the screen, in feet?
Q. The perimeter of a rectangular movie screen at a local cinema is 148 feet. If the length of the screen is 30 feet longer than the width, what is the length of the screen, in feet?
Denoting the width: Let's denote the width of the screen as w feet. According to the problem, the length of the screen is 30 feet longer than the width, so we can express the length as w+30 feet.
Calculating the perimeter: The perimeter of a rectangle is calculated by the formula P=2l+2w, where P is the perimeter, l is the length, and w is the width. We know the perimeter is 148 feet, so we can set up the equation 148=2(w+30)+2w.
Simplifying the equation: Now let's simplify the equation: 148=2w+60+2w
Combining like terms: Combine like terms: 148=4w+60
Isolating the term with w: Subtract 60 from both sides to isolate the term with w: 148−60=4w
Performing the subtraction: Perform the subtraction: 88=4w
Solving for w: Divide both sides by 4 to solve for w: w=488
Calculating the width: Calculate the value of w: w=22 feet
Finding the length: Now that we have the width, we can find the length by adding 30 to the width: l=w+30=22+30
Calculating the length: Calculate the length: l=52 feet
More problems from Pythagorean Theorem and its converse