5 equivalent vertical lines are drawn on a board. 5 equidistant horizontal lines are also drawn on the board cutting the 5 vertical lines and the distance between any two consecutive horizontal lines is equal to that between any two consecutive vertical lines. What is the maximum number of squares, thus formed?

Suppose n is an integer such that the sum of the digits of n is 2, and 10¹⁰ <n < 10¹¹, The number of different values for n is

A man fills a basket with eggs in such a way that the number of eggs added on each successive day is the same as the number already present in the basket. This way the basket gets completely filled i…

In a row of boys, A is 15th from the left and B is fourth from the right. There are three boys between A and B, C is first left of A. What is the position of C from the right?

A solid cube is coloured red on all faces. It is cut into 64 smaller cubes of equal size. How many small cubes have no face coloured?

One fourth of the sum of the odd numbers greater than 14 but less than 50 is the square of -