Sunita's menstrual cycle is 28 days long, and each period lasts about 5 days.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Sunita's menstrual cycle is days long, and each period lasts about days. How many periods start in a year of days, counting only whole cycles? About how many days of the year does she menstruate?
Need a reminder? The key ideaShow
Fertilisation happens in the oviduct and gives a zygote, which divides (one cell, then 2, 4, 8, and so on) and settles in the thick lining of the uterus. The placenta passes glucose and oxygen to the embryo and removes its wastes. Without fertilisation the lining breaks down: menstruation, about once a month.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Whole cycles. , so whole cycles.
Step 2. Days. days.
Answer: periods, about days in the year.
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