A ladder 20 m long is leaning against a vertical wall. It makes an angle of 30° with the ground. How high on the wall does the ladder reach?

If a , b , c are in AP and x , y and z are in GP , then $${x^{b-c}.{y^{c-a}.z^{a-b}=?}}$$

If A's capital is equal to three times of B's capital and if B's capital is equal to four times of C's capital, then the ratio of their capitals is

If 6 men and 8 boys can do a piece of work in 10 days and 26 men and 48 boys can do the same in2days, then the time taken by 15 men and 20 boys to do the same type of work will be

In an election 10 % of the voters on the voter's list did not cast their votes and 60 voters cast their ballot paper blank. There were only two candidates. The winner was supported by 47 % of all the voters in the list and he got 308 votes more than his rival. The number of voters on the list was 

Two pipes, D and E, can fill a cistern in 26 and 78 hours, respectively, while working alone. If the two pipes are opened together, the time taken to fill the cistern is:

The product of two whole numbers is 37. The square root of the difference of the numbers is

What should be added to $$ {10 \ over 11} $$ to get the sum $$ {11 \ over 10} $$?