Question

Pam bought 14 postcards during 7 days of vacation. After 10 days of vacation, how many total postcards will Pam have bought? Solve using unit rates.
postcards

Answer 1

I'm not all that good at math but I'm pretty sure the answers 42 its 7+3=10 so 14x3 so 42

Answer 2

They are implying that the rate is constant at:

14pc/7d= 2 postcards per day

So after 10 days at that rate Pam will have bought 10*2=20 postcards.