Every tree that Bart cuts down gives him 75 pieces of firewood. If he burns 5 logs a day from November 1 through February 28, how many trees will he need to cut down?
Let's think: November has 30 days, December has 31 days, January has 31 days and February has 28 days for a total of 30 + 31 + 31 + 28 = 120 days. He burns 5 pieces of wood every day so 120 * 5 = 600 pieces of wood. Every tree he cuts down supplies 75 pieces of firewood and he will burn 600 pieces so he needs 600 / 75 = 8 trees.. The answer is: 8.

Judy uses 10 pencils during her 5 day school week. A 30 pack of pencils costs $4. How much will she spend on pencils over 45 days?
Let's think: She uses 2 pencils a day because 10 / 5 = 2. She will use 90 pencils in 45 days because 2 x 45 = 90. She will need 3 packs of pencils because 90 / 30 = 3. She will spend $12 because 3 x 4 = 12.. The answer is: 12.

Pauline has 125 matchbox cars. They are all either convertibles, trucks, regular cars. 64% of them are regular cars. 8% are trucks. How many convertibles does she own?
Let's think: The trucks and regular cars make up 72% of her collection because 64 + 8 equals 72. This means convertibles make up 28% of her collection because 100 - 72 equals 28. She has 35 convertibles because 125 times .28 equals 35.. The answer is: 35.

John needs to get a new seeing-eye dog. The adoption fee cost $150 for an untrained dog. It then takes 12 weeks of training which costs $250 a week. After the training, she needs certification which costs $3000 but her insurance covers 90% of that. What is her out-of-pocket cost?
Let's think:
The training cost 250 * 12 = $3000. The insurance pays for 3000 * .9 = $2700 for certification. That means she needs to pay 3000 - 2700 = $300. So her total cost was 150 + 300 + 3000 = $3450.. The answer is: 3450.