Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

What occurs twice in a week, once in a year but never in a day?

A quarter is one-fourth of a dollar but Mr. John has changed the equation as below :

DOLLAR * 4 = QUARTER

Can you replace each letter with a digit to make the above solution correct?

What is the centre of gravity?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

What is next number in the pattern below:

131 517 192 123 ?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

What do you think with the below Picture ?