why number 8549176320 is one of a kind?

Why is a river so rich ?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Next Number in the Series,

5, 16, 49, 104, ?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

what does the below math rebus puzzle mean?

When we see 2 but call 10?