Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

Replace the question mark with the correct number in the below-given picture?

John is looking at Jenifer, but Jenifer is looking at Jacob. John is married, but Jacob is not.

Is a married person looking at an unmarried person ?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

Can you fill the blank with the correct number?

6 30 870 756030 _____

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

Find the next number in the sequence

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

Find the missing number in the sequence below:

An old Woman left INR 33,333 to be divided equally among two fathers and two sons and each was to receive INR 11,111.
How was this possible?