(a) Let the number of children be x<BR>

So, the number of adults is 3x (there are three times as many adults).<BR>

Together, 4x = 62,720<BR>

So, x = 62,720/4, or 15,680<BR>

So the number of adults is 3 times 15,680 or <EM><STRONG>47,040</STRONG></EM><P>


(b) We've worked it out already: <EM><STRONG>15,680</STRONG></EM><P>


(c) The males are 70% of 47,040 plus 60% of 15,680<BR>

That is, 70/100 X 47,040 plus 60/100 X 15,680<BR>

That is 32,928 plus 9408, or 42,336<BR>

So, the fraction of males is 42,336/62,720 or 0.675<BR>

and the percentage of males is 0.675 X 100, or <EM><STRONG>67.5%</STRONG></EM><P>


(d) 40% of the children are girls, i.e. 40% of 15,680 or 6272<BR>

The fraction of girls is 6272/62720, or 0.1<BR>

The percentage of girls is 0.1 X 100, or <EM><STRONG>10%</STRONG></EM><P>

<P>
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