Question

larry bought 15 postcards during 3 days of vacation. after 4 days of vacation, how many total postcards will larry have bought? assume the relationship is directly proportional. □ postcards

Explanation:

Step1: Find daily postcard rate

$\frac{15}{3} = 5$ postcards/day

Step2: Calculate 4-day total

$5 \times 4 = 20$

Answer:

20 postcards