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Here's a riddle guys

Algae grows on a lake and doubles in size every day. After 48 days it covers the entire lake. How many days did it take for it to cover just half the lake?
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Mamapolo2016F
Should be a group BA. My first thought was 24, then, nah - too easy. 馃榿
@Mamapolo2016 right?! Mine too. Definitely took me second. That's why Ihad to share it xD