if 5 a = 3125, then the value of 5(a-3) is : Pick one:  A) 25  B) 125  C) 625  D) 1625  E) None of these
Solution   5 a = 3125 ⇔ 5 a = 5 a ⇔ a = 5.   ∴ 5(a - 3) = 5(5 - 3) = 52 = 25.   25nswer 25
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if 5 a = 3125, then the value of 5(a-3) is :