A man dies of old age on his 25 birthday. How is this possible?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

Count the number of triangles in the picture below:

Today is a very icy and cold morning in Newcastle. Mr Shearer, an office bus driver arrived to pick up the employees from the last stop. Shearer suddenly remembers that he needs to pick a newly joined 4miles to the north. Mr Shearer lost his direction compass, a few minutes later Shearer is able to figure that he is moving in the correct direction i.e. north. How did Shearer know that he is moving in the correct direction?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

What has one eye, but can’t see?

Can you count the number of triangles in the given picture?

How many Watermelons are there in the below picture?