Answer: She will have to spend 8 days on vacation before she will have bought a total of 16 souvenirs.
Explanation:
Given: Ann bought 4 souvenirs during 2 days of vacation.
Per day she buys =
souvenirs [unit rate]
To buy 16 souvenirs , she will take
= 8 days.
Hence, she will have to spend 8 days on vacation before she will have bought a total of 16 souvenirs.