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pickupchik [31]
3 years ago
12

The amount of postage placed on a first class letter depends on the weight of the letter .

Mathematics
1 answer:
Leviafan [203]3 years ago
3 0
Amount is directly proportional to weight
thus
A = kw               A  =  amount
                           k  = constant      ^    which is price per gram
                           w =  weight
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