Water lilies

Water lilies are growing on the pond and their number is doubled every day. The whole layer is covered in 12 days. How many days will it cover 8 layers?

Result

d =  3

Solution:

2d=8 d=ln⁡(8)/ln⁡(2)=32^d=8 \ \\ d=\ln(8)/\ln(2)=3

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