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

Find the next number in the sequence

1, 2, 6, 21, 88, __?

A man died and leaves Rs.10,000 in his will. There are 6 beneficiaries- his 3 sons and their wives. The 3 wives receive Rs.3960 of which Priyanka gets Rs.100 more than Tanu and Neha gets Rs.100 more than Priyanka.
Pramod gets twice as much as his wife, Tushar gets the same as his wife, and Prashant gets 50% more than his wife.

Who is married to whom?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

Find the next number in the series.
1 10 24 43 67 ?

Move three sticks of the spiral below to form a square.

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?