Question

$1 = 5 \\ 2 = 10 \\ 3 = 15 \\ 4 = 20 \\ 5 = ?$

Answer 1

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$1 = 5 \\ 2 = 10 \\ 3 = 15 \\ 4 = 20 \\ 5 = 25$

Difference in the RHS hand side is 5 so the numbers will go by these condition
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Answer 2

5 = 25
because the number is multiplied with 5

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