Can you replace the question mark with the correct number?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

What is the Surname of Barbie Doll?

Count the number of triangles in the picture below:

What does this rebus means ?

PROG WORKRESS

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?

How many triangles are there in the picture below?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

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

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?