What always comes into a house through the keyhole?

Solve below rebus puzzle?

A river should be crossed by a father, a mother and their two sons and two daughters.
There are some rules that should be followed while crossing the river. There can be only two people in the raft while crossing. The daughters cannot be with their father unless there is the presence of the mother. The sons cannot be with their mothers unless the father is present. Unless the guard is on the board, the criminals cannot be with any of the family members. Only the adults like the father, the guard, and the mother knows to use the raft.

How will they cross the river?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

Name the three-letter word that can complete the below words:

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

How many times in a given day, minutes and hour clock comes in a straight line ?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?