Birthday Puzzle

Today is Ramanujan birthday.
A year Ago on his birthday, he had five candles and he lit all except the last one.
Today he is going to light all the candles.

How old is Ramanujan Today?

Note: He is not turning five today.

Answer:

31.

Explanation:
Ramanujan lighting the candles in binary.
11110 =30
11111 =31

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