Question

Natalie was going to sell all of her stamp collection to buy a video game. After selling half of them she changed her mind. She then bought eleven more. How many did she start with if she now has 23?

Answer 1

x/2 + 11 = 23

x/2 = 12

x = 24

She started with 24 stamps.

Answer 2

So if she had 23 now I would say she started with 24:

So 23-11=12 so this was half of the stamps before buying the 11 extra 


but 12x2=24 which would have been to total sum of stamps she started with.