If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

What happened when the wheel was invented?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

What do you see in the image below

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

I’m tall when I’m young, and I’m short when I’m old. What am I?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

If it took eight men ten hours to build a wall, how long would it take four men to build it?