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If 5a = 3125, then the value of 5(a – 3) is:

/ Aptitude, Surds And Indices / By
Question:
If 5a = 3125, then the value of 5(a – 3) is:

[A].

25

[B].

125

[C].

625

[D].

1625

Answer: Option A

Explanation:

5a = 3125       5a = 55

a = 5.

5(a – 3) = 5(5 – 3) = 52 = 25.