Solve the equation in the image by looking at the pattern closely.

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?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?

The answer I give is yes, but what I mean is no. What was the question?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?