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Q1. In a school, ratio of boys to girls is 5:7. The total number of students is 660.This year 25 new boys joined and 35 girls left the school. Find the ratio of boys to girls this year. |
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Answer» This is another way of saying that 7 out of every 12 STUDENTS is a boy and 5 out of every 12 is a girl (7+5=12). We can use this information to determine the PERCENTAGES of the mix:Percentage of boys is: 7÷12=0.58×100=58%Percentage of girls is: 5÷12=0.42×100=42%The # of boys in the CLASS = 60×0.58=35The # of girls in the class = 60×0.42=25Thus, there are 35-25=10 more boys than girls in the class. |
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