In a district, there were 10 000 boys under six in both of two surveys.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
In a district, there were boys under six in both of two surveys. The sex ratio fell from to girls for every boys between them. How many girls were counted in each survey, and how many fewer girls were there in the second?
Need a reminder? The key ideaShow
Sexually transmitted diseases include gonorrhoea, syphilis, warts and HIV-AIDS; a condom reduces their spread. Contraception: barriers, hormone pills, a loop or copper-T, and surgery. Sex ratio ; finding the sex of a child before birth is banned by law.
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. First survey. girls.
Step 2. Second survey. girls.
Step 3. The fall. girls.
Answer: and girls; fewer girls in the second survey.
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