Answer:
for sending 12 postcards she had to be on vacation for 4 days
for sending 1 postcard she would to be on vacation for 4/12=1/3 days
for sending 15 postcards she would to stay
1/3*15
5 days
Explanation:
12/4 = 3 So this means that she sends 3 postcards a day.
15/3 = 5 So she has to be on vacation 5 days in order to send 15 postcards.
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