On a loaf of bread, there is a patch of mold. every day, the patch doubles in size. if it takes 40 days for the patch to cover the entire loaf of bread, how many days would it take for the patch to cover half of the loaf of bread?

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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36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls