yasem77 wrote:A certain rectangular window is twice as long as it is wide. If its perimeter is 10 feet, then its dimensions in feet are
(a) 3/2 by 7/2
(b) 5/3 by 10/3
(c) 2 by 4
(d) 3 by 6
(e) 10/3 by 20/3
P = 2W + 2L.
An alternate approach is to PLUG IN THE ANSWERS, which represent the values of W and L.
When the correct answer choice is plugged in, P=10.
Answer choice D: W=3, L=6
Here, P = (2*3) + (2*6) = 18.
Too big.
Eliminate D and E.
Answer choice B: W=5/3, L=10/3
Here, P = 2(5/3) + 2(10/3) = 10/3 + 20/3 = 30/3 = 10.
Success!
The correct answer is
B.
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