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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MartinTheFirst · 26-30, M

Not a riddle, a math problem...

(A1 - A1*2^48)/(1 + 2) = 1

Find out A1 and then do the same in reverse for 0.5 and replacing 48 with n