A four digit number is formed by writing a two digit number together twice like: 15:15, -3737 etc. A number of this form will be exactly divisible by which of the following numbers 

Directions: Find the wrong number in the following number series:

141, 156, 147, 162, 153, 165, 159

Natu and Buchku each have certain number of oranges. Natu says to Buchku, “If you give me 10 of your oranges, I will have twice the number of oranges left with you”. Buchku replies,“If you give me 10 of your oranges, I will have the same number of oranges as left with you”. What is the number of oranges with Natu and Buchku, respectively?

What will be come in place of question mark(?) in the following number series?
14, 8, 7 , 11.5, 22, ?

For which value of x the seven-digit number 8439x53 is divisible by 99?

The greatest 4-digit number which is a perfect square is

The real number to be added to 13851 to get a number that is divisible by 87 is :

If the 5-digit number 535ab is divisible by 3, 7 and 11, then what is the value of (a² - b² + ab)?