Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

John was a very careless driver, so his owner Jacob gave him an offer that he will get an incentive of Rs.30 for every bottle box he delivered without breaking it and he will be charged Rs.90 for every bottle box he broke. Jacob gave John 100 bottles-box to deliver. After delivery, Jacob paid John Rs.2400. How many bottles-box did John break?

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

What is 3/7 chicken, 2/3 cat and 2/4 goat?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

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

In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?