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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?

The perimeter of a rectangular movie screen at a local cinema is 148148 feet. If the length of the screen is 3030 feet longer than the width, what is the length of the screen, in feet?

Full solution

Q. The perimeter of a rectangular movie screen at a local cinema is 148148 feet. If the length of the screen is 3030 feet longer than the width, what is the length of the screen, in feet?
  1. Denoting the width: Let's denote the width of the screen as w w feet. According to the problem, the length of the screen is 3030 feet longer than the width, so we can express the length as w+30 w + 30 feet.
  2. Calculating the perimeter: The perimeter of a rectangle is calculated by the formula P=2l+2w P = 2l + 2w , where P P is the perimeter, l l is the length, and w w is the width. We know the perimeter is 148148 feet, so we can set up the equation 148=2(w+30)+2w 148 = 2(w + 30) + 2w .
  3. Simplifying the equation: Now let's simplify the equation: \newline 148=2w+60+2w 148 = 2w + 60 + 2w
  4. Combining like terms: Combine like terms: \newline148=4w+60 148 = 4w + 60
  5. Isolating the term with w: Subtract 6060 from both sides to isolate the term with w w : \newline 14860=4w 148 - 60 = 4w
  6. Performing the subtraction: Perform the subtraction: \newline 88=4w 88 = 4w
  7. Solving for w: Divide both sides by 44 to solve for w w : \newlinew=884 w = \frac{88}{4}
  8. Calculating the width: Calculate the value of w w : \newlinew=22 w = 22 feet
  9. Finding the length: Now that we have the width, we can find the length by adding 3030 to the width: \newlinel=w+30=22+30 l = w + 30 = 22 + 30
  10. Calculating the length: Calculate the length: \newlinel=52 l = 52 feet

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