18 percent of the coal was destroyed in a coal mine. If only 492 tons of coal was received, then tell how much coal was destroyed?

The difference of two numbers is 20 % of the larger number. If the smaller number is 20, the larger number is:

If the population of a town is 64000 and its annual increase is 10%, then its population at the end of 3 yeas will be :

If the radius of a circle is decreased by 50%, its area is reduced by

B got 20% marks less than A. What per cent marks did A got more than B? 

In an election 20% of the voters did not vote and 120 votes were invalid. Winner got 200 votes more than this opponent and secured 41% votes of the total number of votes. What percentage of the votes defeated candidate got out of the total votes cast?

Ajay spends 25% of his salary on house rent, 5% on food grains, 15% on travel and 10% on clothes and saves 27000, what is Ajay's monthly income?

Sandeep's salary is 20% more than that of Aron. If Sandeep saves Rs.720 which is 4% of his salary, then Aron's salary (in Rs.) is