Question

Joan sold half of her comic books and then bought 8 more. She now has 11. How many did she begin with?

Answer 1

Answer:

14

Step-by-step explanation:

Let's construct an equation for the question and solve it

Let the number of comic books that Joan had in the beginning is

x

In the start she sold half her books (so,multiply by

1

2

)

x

⋅

1

2

Next, she bought

8

more books (so,add

8

)

x

⋅

1

2

+

8

At the last she has

15

books (so,let the equation equal

15

)

x

⋅

1

2

+

8

=

15

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Now let's solve the completed equation

→

x

⋅

1

2

+

8

=

15

Subtract

8

both sides

→

x

⋅

1

2

+

8

−

8

=

15

−

8

→

x

⋅

1

2

=

7

Multiply both sides by

2

→

x

⋅

1

2

⋅

2

=

7

⋅

2

⇒

x

=

14

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

So Joan started with

14

comic books

Hope this helps !...

:)

Answer 2

Answer:

6

Step-by-step explanation:

11-8=3

3x2=6

So, the answer is 6