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
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.
