Question 1114316
Solve for t, 70 = t/log (0.1/20) base 1/2.
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{{{t/log(1/2,0.1/20) = 70}}}
{{{t = 70*log(0.5,0.005)}}}
{{{t = 70*log(0.005)/log(0.5)}}}
t =~ 535.07