Lionardo Messy, true to his name, sweats a lot. Once after an intense game of football, he came
home and took a long, warm bath in his bathtub. He got a call from his mother, who wanted him
to travel home immediately. Messy
left his home in a hurry and forgot to drain the bathtub. Now
incidentally, there was one single mutant bacterium in the bathtub when he got out, and this
bacterium multiplies in a way that its numbers double every day. Assuming that Lionardo got
back home 24 days later and found his bathtub filled to the brim with bacteria, what day would
the bathtub be half full?
Your Answer
a) 23
b) 12
c) 18
d) 21

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