Abby bought 8 postcards during 2 days of vacation. how many days will abby have to spend on vacation before she will have bought a total of 20 postcards?

Abby need to spent 5 days on vacation to buy 20 postcards.

Step-by-step explanation:

Given:

Number of Postcard brought by Abby in 2 days of vacation = 8

Number of days of vacation = 2

We need find Number of days to spend on vacation to buy 20 Postcards

2 days = 8 postcards

1 day = Number of Postcard in 1 day

By using Unitary method we get;

Number of Postcard in 1 day =

Now we know that in 1 day he bought 4 Postcards So we need to find the Number of days to buy 20 postcards.

By Again using Unitary method we get;

Number of days to buy 20 postcards =

Hence Abby need to spent 5 days on vacation to buy 20 postcards.

the forst and 3rd

step-by-step explanation: