Question

Molly 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 fifteen more how many did she start with if she now has 35

Answer 1

The answer is 40. She now has 35, before buying the 15 new stamps she would have had 20 (35-15)...which was half of how many she originally started with. So if 20 is half, then the original amount was 40.