Answer
6 weeks
Work Step by Step
$t = 1/c * ln (A/(A-N))$
$c=.17$
$N =15$
$A =24$
$t = 1/c * ln (A/(A-N))$
$t = 1/.17 * ln (24/(24-15))$
$t = 5.88 * ln (24/9)$
$t = 5.88 * ln (2.66666)$
$t = 5.88 *.980$
$t =5.767$
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