what does this picture(rebus) riddle means ?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Which is heavier: a ton of bricks or a ton of feathers?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

All of the flowers I have are orchids except two. All of the flowers I have are hibiscuses except two. All of the flowers I have are roses except two.

Can you tell me how many flowers I have?

What four weights can be used to balance from 1 to 30 pounds?

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?

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.