2
It takes 42 postage stamps
The number of stamps must equal the amount of postage. The postage depends on the weight and and form of transport.
One if it is enough postage.
One 54c stamp
One.
The stamps have to add up to 45 cents.
20 stamps
one
Postage is based on weight, not distance.
Just one.
One first class postage.
umm 1000