The average of the two-digit numbers which remain the same when the digits interchange their position is -

If 15% of 40 is greater than 25% of a number by 2, then the number is-

Chose the pair of numbers which comes next: 75,65,85,55,45,85,35.........

If the sides of a square increase by 10%,how much will the area be increased in percentage ?

If the average of 5 consecutive number is 12, what is the sum of the least and the grater of the integer?

At a party,everyone shake hands with everybody else. If there were 66 handshakes, how many people were at the...

Three pipes P, Q and R can fill a tank in 6 hours. After running all three together for 2 hours, R is closed a...