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Question: How many weeks are there in 21 days?

A ) 7 weeks
B ) 5 weeks 5 days
C ) 3 weeks
D ) 21 weeks

Steps to derive

1 The conversion is from smaller to larger unit, so divide.

 [Conversion from days to week.]
2 7 days = 1 week

 [Divide 21 days by 7 days, to convert into weeks.]
3 21 days = (217) weeks

 [Simplify]
4 = 3 weeks

5 So, 21 days are 3 weeks.



Hence the right answer is Option C

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