You are here:

Advanced Math/Cost- Flooring


Oak flooring is to be installed in a room with dimensions 16' x 18'.  Determine cost of the flooring at $75 per 1000.  Allow 1/5 for matching and waste.


"Allow ⅕ for matching and waste" is ambiguous. Does the ⅕ refer to the area of the floor, or to the quantity purchased? I'll show both interpretations.
area of floor = 16 ft × 18 ft = 288 ft²

Case 1: ⅕ the area of the floor must be added for matching and waste
matching and waste = ⅕ of 288 ft² = 57.6 ft²
flooring purchased = 288 + 57.6 = 345.6 ft²
345.6 ft² × $75/(1000 ft²) = $25.92
Case 2: ⅕ of the flooring purchased is for matching and waste.
Purchase x square feet of flooring.
⅕ of x is for matching and waste.
⅘ of x = area of floor = 288 ft²
x = 360 ft²
360 ft² × $75/(1000 ft²) = $27

I cannot say which approach you are expected to use.

Advanced Math

All Answers

Answers by Expert:

Ask Experts


Janet Yang


I can answer questions in Algebra, Basic Math, Calculus, Differential Equations, Geometry, Number Theory, and Word Problems. I would not feel comfortable answering questions in Probability and Statistics or Topology because I have not studied these in depth.


I tutor students (fifth through twelfth grades) and am a Top Contributor on Yahoo!Answers with over 24,000 math solutions.

Co-author of An Outline of Scientific Writing: For Researchers With English as a Foreign Language

I have a Bachelor's degree in Applied Mathematics from the University of California at Berkeley.

Past/Present Clients
George White Elementary School. Homework Help program at the Ridgewood Public Library, Ridgewood, NJ. Individual students.

©2016 All rights reserved.