A woman takes a pill every day for 21 days…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A woman takes a pill every day for days. Then there is a gap of days with no pill, and menstruation takes place. After the gap the next pack is started. She follows this pattern for packs.
- How many pills does she take in all?
- How many days pass from the first pill of the first pack to the first pill of the ninth pack?
- How many of these days are days with no pill?
Need a reminder? The key ideaShow
The pills are taken for days, and then there is a gap of days with menstruation. Saheli is taken once a week. Emergency contraceptives are used within hours of coitus. Vasectomy cuts the vas deferens, and tubectomy cuts the fallopian tubes. Reversal of both is poor.
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.
Given. pill days and gap days in each pack. packs.
Plan. Multiply the numbers for one pack by .
Step 1. Pills. pills.
Step 2. Days. One round is days. For rounds: days.
Step 3. Days with no pill. days.
Answer: pills; days; days.
Check. , so the pill days and the gap days add up to all the days.
Watch out. The next pack is started after the gap, so the first pill of the ninth pack comes on day . The time between the first pills is days.
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