SajjadAhmad
If a rectangular floor tile has a minimum area of 46 square inches and a maximum perimeter of 29 inches, and if its length and width can both be expressed as different whole numbers of inches, what is the length, in inches, of the longer side of the floor tile?
A. 6
B. 8
C.12
D.16
E. 24
Source: McGraw-Hill's GMAT (1-27)
We can let L = the length of the tile and W = the width of the tile and create the following inequalities.
LW ≥ 46
and
2(L + W) ≤ 29
Simplifying the second inequality, we have L + W ≤ 14.5. Since L and W are whole numbers, we see that if L = 7, then W ≤ 7. Since L and W are different whole numbers, then W can’t equal 7, so it is actually no more than 6. However, in that case the area of the tile will be no more than 7 x 6 = 42. However, we are given that the area of the tile is at least 46. Therefore, L can’t be 7.
If L = 8, then W ≤ 6. Now if W = 6, then we have the area of the tile as 8 x 6 = 48, which is greater than 46. So the length of the tile could be 8.
Answer: B