In Convent Model School,$60 \%$ of the students are boys. In an aptitude test,$80 \%$ of the girls scored more than $40$ marks (out of a maximum possible $150$ marks). If $60 \%$ of the total students scored more than $40$ marks in the same test,find the fraction of the boys who scored $40$ marks or less?

In expressing a length $81.472 \, km$ as nearly as possible with three significant digits,find the percentage error?

In an examination,it is required to get $256$ of the total maximum aggregate marks to pass. $A$ student gets $192$ marks and is declared failed. The difference between the marks obtained by the student and the marks required to pass is $10 \%$. What are the maximum aggregate marks a student can get?

In a gram panchayat meeting,$1000$ people voted on a resolution with $10 \%$ of the votes being invalid. After some discussion,$1000$ people voted again. This time there were $20 \%$ invalid votes. The opponents were increased by $50 \%$ while the motion was now rejected by a majority,which is $300 \%$ more than it was formerly passed by. How many people voted against the resolution before the discussion?

In a test,the minimum passing percentage for girls and boys is $35 \%$ and $40 \%$ respectively. $A$ boy scored $483$ marks and failed by $117$ marks. What are the minimum passing marks for girls?

$405$ sweets were distributed equally among children in such a way that the number of sweets received by each child is $20 \%$ of the total number of children. How many sweets did each child receive?