SOLUTION: A letter weighs 90 grams. One stamp is needed for each 28 grams or portion thereof. How many stamps does the letter require?

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Question 837821: A letter weighs 90 grams. One stamp is needed for each 28 grams or portion thereof. How many stamps does the letter require?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+90%2F28+=+3.214+
This is more than +3+, so
4 stamps are needed
In terms of just the units, this is:
( grams/letter ) / ( grams/stamp ) = ( grams/letter )x( stamps/gram )
and
( grams/letter )x( stamps/gram ) = stamps/letter