Q: A school is adding 5 rows of seats to the auditorium. Each row has 8 seats and each seat costs $30. A parent, being a seat manufacturer, offered a 10% discount on each group of 10 seats purchased. How much will the school pay for the new seats?
A: Ten seats amount to $30 x 10 = $300. So there is $300 x 10 / 100 = $30 discount for each 10 seats purchased. Thus, the total cost for every 10 seats is $300 - $30 = $270. The school is going to buy 5 x 8 = 40 seats. This means that the school is going to buy 40 / 10 = 4 sets of 10 seats. Therefore, the school will pay a total of $270 x 4 = $1080 for the new seats. The answer is 1080.

Q: Mike decides to do more pull-ups to increase his strength for climbing. He uses the greasing the groove technique where every time he goes into a certain room he does 2 pull-ups. He decides to use his office. He goes in there 5 times a day every day. How many pull-ups does he do a week?
A: He does 5 * 2 = 10 pull - ups a day. So he does 10 * 7 = 70 pull - ups a week. The answer is 70.

Q: The toothpaste in Anne's family's bathroom contains 105 grams. Anne's dad uses 3 grams at each brushing, her mom uses 2 grams, Anne and her brother use 1 gram each. Each member of the family brushes their teeth three times a day. How many days will it take for the toothpaste to run out?
A:
Anne and her brother use 1 gram + 1 gram = 2 grams. Anne's dad uses 3 grams and Anne's mom uses 2 grams so together they use 2 grams + 3 grams + 2 grams = 7 grams / wash. Each day, the family uses 7 grams / wash * 3 washes / day = 21 grams. Using that amount daily, the toothpaste will last 105 grams / 21 grams / day = 5 days. The answer is 5.