Life expectancy is defined by the formula 2SB/G, where S = shoe size, B = average monthly electric bill in dollars, and G = GMAT score. If Melvin's GMAT score is twice his monthly electric bill, and his life expectancy is 80, what is his shoe size?	Choose the correct choice from the following answers:
A) 80 B) 70 C) 75 D) 40 E) 50
Solution -   Given that, G = 2B and Life expectancy(L) = 80   L=2SB/G -&gt; 80 = 2SB/2B --&gt; S=80.   80NS 80
<result>A</result>
Life expectancy is defined by the formula 2SB/G, where S = shoe size, B = average monthly electric bill in dollars, and G = GMAT score. If Melvin's GMAT score is twice his monthly electric bill, and his life expectancy is 80, what is his shoe size?