What four weights can be used to balance from 1 to 30 pounds?

Thirty friends were on a hiking trip when they decided to enjoy the bonfire. They assembled for it and agreed to play a game. For that, they divided themselves into five teams with seven members each, forming five rows.

How did they manage to achieve this formation?

In the picture given below, can you find out which digit will take place of the question mark?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

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

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

There are three Athletes (John, Tarun and Harish) and their individual Coaches (Jacob, Meenaxi and Priyanka) standing on the shore.
No Coach trusts their Athlete to be near any other Coach unless they are also with them.
There is a boat that can hold a maximum of two persons.
How can the six people get across the river?

If 1+9+8=1, what is 2+8+9?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

Solve the following series:
AZ, GT, MN, __, YB