Two women use oral contraceptives for 26 weeks…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Two women use oral contraceptives for weeks. The first takes the kind that NCERT describes: a pill every day for days, then no pill for days, repeated from the start of the period of use. The second takes Saheli, a pill taken once a week.
- How many days are there in weeks?
- How many tablets does the first woman take?
- How many tablets does the second woman take?
- How many times as many tablets does the first woman take, to one decimal place?
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. weeks. A pack is days with a pill and days without.
Plan. Find the days, then count the tablets in each case.
Step 1. Days. days.
Step 2. The daily pill. Six complete packs take days, with tablets. The days that are left are days. They are the first days of a new pack, all with a pill, so there are more tablets. Total: tablets.
Step 3. The weekly pill. One tablet each week, so tablets.
Step 4. The ratio. .
Answer: days; tablets; tablets; times as many.
Check. of every days have a pill, which is . Then , and is close, because the last days all fall in a pill phase.
Watch out. A user does not choose between the two kinds by counting tablets. The count shows only that a weekly pill needs far fewer.
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