[Question]: Sally is selling boxes of crackers for her scout troop's fund-raiser. If she sells 50% more on Sunday than she sold on Saturday, then she'll have sold a total of 150 boxes on the two days. How many boxes did she sell on Saturday?
[Answer]: Let S be the number of boxes sold on Saturday. S + 1.5S = 150. 2.5S = 150. S = 60. Sally sold 60 boxes on Saturday.
So the answer is 60.

[Question]: Rachel earned $200 babysitting. She spent 1/4 of the money on lunch. She spent 1/2 of the money on a DVD. How much did Rachel have left?
[Answer]: Rachel spent 1 / 4 * 200 = $50 on lunch. Rachel spent 1 / 2 * 200 = $100 on a DVD. Rachel has 200 - 50 - 100 = $50 left.
So the answer is 50.

[Question]: Bridge and Sarah have $3 between them. If Bridget has 50 cents more than Sarah, how many cents does Sarah have?
[Answer]:
Let X be the amount of money Sarah has, so Bridget has X + 50 cents. We know that Sarah and Bridget combined have $3, or 300 cents, so X + X + 50 = 300. We therefore know that 2X = 250. So Sarah has 250 / 2 = 125 cents.
So the answer is 125.