Bunuel wrote:
A carpet is y yards long and f feet wide. How many dollars will it cost if the carpet sells for x cents per square foot? (1 yard = 3 feet)
(A) xyf
(B) 3xyf
(C) xyf/3
(D) 0.03yf/x
(E) 0.03xyf
To make things easier, we'll pick easy numbers for x, y and f.
This is an Alternative approach.
Say y = 1 yard = 3 feet, f = 1 foot and x = 100 cents = 1 dollar per square foot.
Then our total cost in feet per dollar is 3*1*1 = 3 dollars.
Looking at our answer,
A. 1*1*100 = 100 NO.
B. 3*100*1*1 = 300 NO.
C. 100*1*1/3 = 100/3 NO.
D. 0.03*1*1/100 = 0.03/100 NO.
E. 0.03*100*1*1 = 3.
(E) is our answer.
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48% (01:26) correct 
