If x/y = 2/z, then 5x^2 =	Choose the correct choice:
A) y/z
B) 20y²/z²
C) y²z²
D) 5y²/z²
E) yz
This question is most easily solved by isolating y in the equation and substituting into the expression 5x²:   x/y = 2/z   x = 2y/z   If we substitute 2y/z into the expression for x, we get:   5(2y/z)² = 5(4y²/z²) = 20y²/z².   The correct answer is choice (20y²/z²)
<result>B</result>
If x/y = 2/z, then 5x^2 =