Kaylee needs to sell 33 boxes of biscuits. So far, she has sold 12 boxes of lemon biscuits to her aunt, 5 boxes of chocolate biscuits to her mother, and 4 boxes of oatmeal biscuits to a neighbor. How many more boxes of biscuits does Kaylee need to sell?
Let's think: The number of boxes already sold is 12 + 5 + 4 = 21. Kaylee needs to sell 33 − 21 = 12 more boxes.. The answer is: 12.

For the summer, the clothing store has a 50% discount for all items. On Wednesdays, there is an additional $10.00 off on all jeans after the summer discount is applied. Before the sales tax applies, the cost of a pair of jeans is $14.50. How much was the original cost for the jeans before all the discounts?
Let's think: Before the Wednesday discount, the cost of the jean is $14.50 + $10.00 = $24.50. Since the original price was reduced by 50%, the original cost for the jeans is $24.50 * 2 = $49.00.. The answer is: 49.

A bag was originally priced at $500. A week after, the price was reduced by 5%. Since the bag was still not sold, the selling price was reduced by 4% a month after. How much was the total reduction from the original selling price?
Let's think: The original price of the bag was reduced by $500 x 5 / 100 = $25. So its selling price after a week was $500 - $25 = $475. The price of the bag was again reduced by $475 x 4 / 100 = $19. So, its selling price now is $475 - $19 = $456. Therefore, the total reduction from the selling price is $500 - $456 = $44.. The answer is: 44.

There are 10 students in a class. The average age of 9 of them is 8 years. By how many years will this average increase if the tenth student is (quite strangely) 28 years old?
Let's think:
9 students have an average age of 8 years so the sum of their ages is 9 * 8 = 72 years. A tenth student who is 28 years old will make the sum 72 + 28 = 100 years. The new average age will be 100 / 10 = 10 years. This is 10 - 8 = 2 years higher than the previous average.. The answer is: 2.