Straw or a See Saw?

How can you increase the mechanical advantage of a see-saw without their changing its length?

Two straws are drawn at random with replacement from a packet containing 13 red and 11 blue straws.Find the probability that at least one of the straws is red.

Chinawares are wrapped in straw paper before packing. Why ?

Straws are used to take soft drinks. Why ?

If paper is called wood, wood is called straw, straw is called grass, grass is called rubber and rubber is called cloth, what is the furniture made up of? 1) Paper 2) Wood 3) Straw 4) Grass 5) None of these