Which number should replace both the asterisks in (* /21) x (*/84) = 1 ? Pick:	A) 21	B) 42	C) 63	D) 72	E) 168
Let (y/21) x (y/84) = 1   y^2 = 21 x 84 = 21 x 21 x 4   y = (21 x 2) = 42   The answer is 42.
<result>B</result>
Which number should replace both the asterisks in (* /21) x (*/84) = 1 ?