Question

Which of the following represents xy = 64?

Options

• 8 : x = 8 : y

• x : 16 = y : 4

• x : 8 = y : 8

• 32 : x = y : 2

Answer 1

32 : x = y : 2

Explanation:

For the last proportion, `32/x = y/2` gives xy = 64 by cross-multiplication. The first three options instead imply x = y or a different relation.