Becky sent 12 postcards during her 4‑day vacation. How many days would she have to be on vacation to send 15 postcards?

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

b) 1/3 * 1/5

step-by-step explanation:

each smallest part is 1/15 since the written one is 1/5 and it's divided by 3 equal parts. (1/5 )/3 = 1/15 = 1/3 * 1/5

answer: 0.64

step-by-step explanation: