Answers

2014-11-08T16:58:41+05:30
20% of 20 = .2 * 20 20 *.2 = 4. Therefore there are 4 girls. 20-4=16 Therefore there are 16 boys and 4 girls.
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2014-11-08T17:14:01+05:30
here the total percent=100%
percentage of girls=20%
total number of students=20
so 
the number of girls=20/100*20
                   =4
so the number of boys=20-4=16
 there are 16 boys in that class
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