Solution:
The decay formula can be written as:
"N=N_0\\times 2^{-\\frac{t}{t_{1\/2}}}"
Therefore:
"t=-log_2(\\frac{N}{N_0})\\times t_{1\/2}=-log_2(\\frac{0.5g}{100g})\\times 20\\,minutes\\approx153\\,minutes"
Answer: 153 minutes
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