Question

Life expectancy is defined by the formula $\frac{2SB}{G}$, 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, an his life expectancy is $50$, what is his shoe size?

• A. $40$
• B. $50$
• C. $60$
• D. $80$

Answer 1

The correct option is B $50$

Substitute $2B$ for $G$ in the formula. Note that the term $2B$ appears in both the numerator and denominator, so they cancel out.
$\frac{2SB}{2B}=50$
$S=50$