Find 80 / ? = ? / 20 Choose the correct choice.
A) 40	B) 400	C) 800	D) 1600	E) None
Answer   Let 80/y = y/20   Then, y 2 = 80 x 20 = 1600   ∴ y = √1600 = 40.   Option: 40
<result>A</result>
Find 80 / ? = ? / 20