$1200$ boys and $650$ girls appeared in an examination. If $70 \%$ of boys and $40 \%$ of girls failed,find the approximate percentage of passed students.

Akash scored $73$ marks in subject $A$. He scored $56 \%$ marks in subject $B$ and $X$ marks in subject $C$. Maximum marks in each subject were $150$. The overall percentage marks obtained by Akash in all three subjects together was $54 \%$. How many marks did he score in subject $C$?

$A, B, C$ are three students. $A$ got $18 \%$ more marks than $B$ and $12 \%$ less than $C$. If $B$ got $220$ marks,how many marks did $C$ get?

$A$ shopkeeper undertakes to supply $2000$ tables at $Rs. 1725$ each. He estimates that if $10\%$ are defective,which will be sold at $50\%$ of the original price,then the profit will be $15\%$ on his whole outlay. When the tables were supplied,$70\%$ of the tables were found defective. What loss did the shopkeeper incur?

In a class of $80$ students,each student got sweets that are $15 \%$ of the total number of students. How many sweets were there?

The difference between two numbers is $1600$. If $7.5\%$ of one number is equal to $12.5\%$ of the other number,find the two numbers.