Answer
$125$ ways.
Work Step by Step
The Fundamental Counting Principle:
The number of ways in which a series of successive things can occur is found by multiplying the number of ways in which each thing can occur.
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1. You can answer the 1st question in 5 ways.
2. You can answer the 2nd question in 5 ways.
3. You can answer the 3rd question in 5 ways.
Total ways = $5\times 5\times 5=5^{3}= 125$ ways.