900 boys and 600 girls appeared in an examination of which 70% of the boys and 85%of the girls passed out in the examination. Find the total percentage of students who did not pass.

If x % of 600 is 450 then, find the value of x.

When a number is decreased by 25% it becomes 120. Find the number.

If the price of Orid dhall after 20% increase is Rs. 96 per kg, find the original price of Orid dhall per kg.

In a leadership election between two persons A and B, A wins by a margin of 192 votes. If A gets 58% of the total votes, find the total votes polled.