39 days would it take for the patch to cover half of the loaf of bread
We have given that on a loaf of bread, there is a patch of mold. Every day, the patch doubles in size.
Number of days for the patch to cover the entire loaf of bread = 40 days
if we go forward, the mold doubles in size in one day and if we go backwards the mold covers half the size in one less day.
So, number of days for the patch to cover the entire loaf of bread - 1
=40 — 1
= 39
Therefore, it would takes 39 days for the patch to cover half of the loaf of bread.
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