kathy needs to mail a gift card to a friend. she uses 48 cents stamps and 7 cent stamps to pay 2.55 in postage. how much of each stamp did kathy use

Answer 1

She MUST use between 1 and 5 stamps worth 48 cents. Then, the REMAINDER DIVIDED by 7 MUST BE an integer. [Note: generally start with largest value.]

There is only one choice for a whole number.

Kathy uses 4 stamps worth 48 cents and 9 stamps worth 7 cents.

4*$0.48 + 9*$0.07

$1.92 + $0.63

$2.55