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If 5a = 3125 then the value of 5(a - 3)...

This question belongs to Arithmetic Ability Surds And Indices
Surds and Indices
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If 5a = 3125, then the value of 5(a - 3) is:

Answer & Solution
Correct Answer: Option A
5a = 3125     ⇔     5a = 55
⇒ a = 5.
∴ 5(a - 3) = 5(5 - 3) = 52 = 25
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