SSC CHSL Model Paper 13

Total student in A $=1800\times \frac{20}{100}=360$
Percentage difference of Boys and girls $=\frac{360\times \frac{\left(5-4\right)}{9}}{360}\times 100$ $=\frac{1}{9}\times 100=11\frac{1}{9}\%$
Total Student in C $=1800\times \frac{14}{100}=252$
Percentage difference of Boys and Girls $=\frac{252\times \frac{1}{7}}{252}\times 100=14\frac{2}{7}\%$
Total student in D $=1800\times \frac{22}{100}=396$
Percentage difference of Boys and Girls $=\frac{396\times \frac{1}{11}}{396}\times 100=8\frac{1}{11}\%$
Total student in E $=1800\times \frac{10}{100}=180$
Percentage difference of Boys and Girls $=\frac{180\times \frac{1}{5}}{180}\times 100=20\%$
∴ Lowest percentage difference is D.