Question

80.) The quantity of water in a tank gets one-halved of the available amount every minute.
After how much time will the full tank be left with only 61% of the water ?
(a) 20 minutes (b) 16 minutes (c) 8 minutes (d 4 minutes
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Answer 1

Answer:

hey

I think answer is

option C

Answer 2

Answer:

option c 8 min is correct. ......