Apply half life equation
A = A0*(1/2)^(t/HL)
0.27 = 15.3*(0.5)^(t/5730)
t = 5730* ln(0.27 /15.3 ) / ln(0.5)
t = 33373.974 years old
A skeleton has a carbon-14 decay rate of 0.27 disintegrations per minute per gram of carbon....
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