A certain preparation includes two beta-active components
with different half-lifes. The measurements resulted in the following
dependence of the natural logarithm of preparation activity on
time t expressed in hours:
t 0 1 2 3 5 7 10 14 20
In A 4.10 3.60 3.10 2.60 2.06 1.82 1.60 1.32 0.90
Find the half-lifes of both components and the ratio of radioactive
nuclei of these components at the moment t = 0.