Question

Shawna 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 five more. How many did she start with if she now has 30?

Answer 1

She started with 50 stamps

Explanation:

Hi! For these types of problems we always result to going backwards. So, she now has 30 right? So, to reverse into the problem, we do the opposite of what it says. "She then bought five more" 30 - 5 = 25. Then it says she sold half of them. 25 x 2 = 50. If we recheck by going back, she sold half of them (50 / 2 = 25) and she bought five more (25 + 5 = 30).

Hope this helps!