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1. Which of the following represents ab = 64?

Solution:
A = 8 : a = 8 : b ⇒ 8a = 8b ⇒ a = b.
B = a : 16 = b : 4 ⇒ 4a = 16b ⇒ a = 4b
C = a : 8 = b : 8 ⇒ 8a = 8b ⇒ b = a
D = 32 : a = b : 2 ⇒ ab =64

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