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.

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step-by-step explanation:

d, x=8

step-by-step explanation:

simplifying

4x + -5 = 2x + 11

reorder the terms:

-5 + 4x = 2x + 11

reorder the terms:

-5 + 4x = 11 + 2x

solving

-5 + 4x = 11 + 2x

solving for variable 'x'.

move all terms containing x to the left, all other terms to the right.

add '-2x' to each side of the equation.

-5 + 4x + -2x = 11 + 2x + -2x

combine like terms: 4x + -2x = 2x

-5 + 2x = 11 + 2x + -2x

combine like terms: 2x + -2x = 0

-5 + 2x = 11 + 0

-5 + 2x = 11

add '5' to each side of the equation.

-5 + 5 + 2x = 11 + 5

combine like terms: -5 + 5 = 0

0 + 2x = 11 + 5

2x = 11 + 5

combine like terms: 11 + 5 = 16

2x = 16

divide each side by '2'.