AREA

posted by .

A square lobby is to be tiled at Php160 per square meter. if the lobby were 2m narrower and 2m longer, the cost of tiling would be Php35,360. Find the dimension of the lobby.

(pls write the solutions.... thanks)

  • AREA -

    original size of lobby : x m by x m
    new size = x-2 by x+2

    area = (x-2)(x+2) = x^2 - 4
    cost equation:

    160(x^2 - 4) = 35360
    x^2 - 4 = 221
    x^2 = 225
    x = ± 15 , but x must be positive, so

    x = 15

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math

    a house has two rooms of equal area. one room is square and the other room a rectangle, four feet narrower and 5ft longer than the square one. find the area of each room?
  2. Statistics

    A bank lobby has four video cameras positioned to view the entire lobby. any one of the four is sufficient to monitor the lobby. each camera functions independently and has a reability of 0.90, that is, the probability of functioning …
  3. math

    Lena is tiling a square floor with each side 3 metres long. Tiles cost $45 per square metre. Which calculation gives the total cost of tiling the floor (in dollars)?
  4. math

    Suppose that you are responsible for predicting the cost of constructing a new office building. You find that the first story costs 500 dollars per square meter of floor space, and the second story costs 600 dollars per square meter. …
  5. grammar

    their are children waiting in the lobby what is the simple subject
  6. English

    Select the letter of the answer that best corrects the element in parentheses. Answer should reflect clearest and concise wording and not change the meaning of the sentence. He agreed to to interview the candidate (waiting in the lobby …
  7. Math

    Your school is planning to put an aquarium with 30 fish in it in the main lobby. To accommodate this number of fish, the aquarium should be between 50 and 60 cubic feet of water. To help reduce costs, the surface area of the aquarium …
  8. English, Business English, Communications

    I revised this memo to approve the you-attitude. Can someone tell me if I did it correctly?
  9. Math

    The floor of a round hut is 10m in diameter. A weaver charges $15.50 to make a mat to fit the floor . Find the cost of the mat per square meter . Work- area of a circle = 3.1 * 5*5=77.5 Cost per square meter =77.5\15.5= 5 cents per …
  10. math

    a rectangle with dimension 30/7 m by 20/7 m is to be completely tiled with identical square tiles with no overlapping or cutting. Find the side length of the largest square tile which will accomplish the task.

More Similar Questions