Can you answer this?

Question

a pond has 1 Lily pad on its 1st day. every day that passes, the lily pads doubles. the pond is full of lily pads on the 49th day.

what day was the pond half full?
you must answer with the given information.
no cheating!! answer straight away!

Answer 1

48th day

Answer 2

2^(49-1)/2 = 2^(48-1)

Answer 3

Damn. I didn't know Trump was a genius!

Answer 4

it was that puzzel i heard first when i was 8
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