Caitlyn needs to mail a USB drive to a friend. She uses 45-cent stamps and 7-cent stamps to pay $1.91 in postage. How many of each stamp did Caitlyn use?
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jamesmary00965
Sunday, May 28, 2023
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Caitlyn needs to mail a USB drive to a friend. She uses 45-cent stamps and 7-cent stamps to pay $1.91 in postage. How many of each stamp did Caitlyn use?
Caitlyn used 1 of the 45-cent stamps & she used 22 of the 7-cent stamps
191 = 7* 27 + 2
191 = 4* 45 + 11
191 = 3* 45 + 56
181 = 3*45 + 8*7
So Caitlin used 3 45-cent stamps and 8 7-cent stamps.
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