Question: Mandy has three $20 bills while Manny has two $50 bills. If both of them decide to exchange their bills for $10 bills, how many more $10 bills than Mandy will Manny have?
Answer: Mandy has a total of $20 x 3 = $60. So, she will have $60 / $10 = 6 $10 bills. Manny has a total of $50 x 2 = $100. So, he will have $100 / $10 = 10 $10 bills. Hence, Manny has 10 - 6 = 4 more $10 bills than Mandy. The answer is 4.

Question: In North Carolina, Jim bought 10 gallons of gas at $2.00/gallon. He paid $1.00 more per gallon in Virginia where he bought another 10 gallons of gas. How much has he spent on gas?
Answer: In North Carolina, he bought 10 gallons at $2.00 / gallon for a total of 10 * 2 = $20.00. He paid $2.00 a gallon in North Carolina and $1.00 more in Virginia for a total of 2 + 1 = $3.00 / gallon. He bought 10 gallons at $3.00 / gallon in Virginia for a total of 10 * 3 = $30.00. He spent $20.00 in North Carolina and $30.00 in Virginia for total of 20 + 30 = $50.00. The answer is 50.

Question: Keith bought 8 new baseball trading cards to add to his collection. The next day his dog ate half of his collection. There are now only 46 cards left. How many cards did Keith start with?
Answer: Keith's dog ate half of his collection so he had 2 * 46 cards = 92 cards before his dog ate them. Keith had added 8 new cards to his collection so he had 92 cards - 8 = 84 cards to start with. The answer is 84.

Question: To make 3 liters of ketchup Ashley needs 69 kg of tomatoes. How many kilos of tomatoes does Ashley need to make 5 liters of ketchup?
Answer:
One liter of ketchup is made from 69 kg / 3 liters = 23 kg / liter of tomatoes. Ashley needs 23 kg / liter * 5 liters = 115 kg of tomatoes. The answer is 115.