What does the below rebus riddle means?

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

Solve the rebus riddle in the picture below.

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Doctor Alex and a bus driver John are both in love with the same woman named Olivia. The bus driver need to go for a long trip of 10 days, Before he left he gave Olivia 10 apples.

Can you find out the total number of triangles in the given figure?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

Count the number of triangles in the picture below:

I am white when I am dirty, and black when I am clean. What am I?