Q: Eddie can bake 3 pies a day. His sister can bake 6 pies while his mother can bake 8 pies a day. How many pies will they be able to bake in 7 days?
A: Eddie bakes 3 x 7 = 21 pies for 7 days. His sister bakes 6 x 7 = 42 pies for 7 days. His mother can bake 8 x 7 = 56 pies for 7 days. Therefore, they are able to bake 21 + 42 + 56 = 119 pies in 7 days. The answer is 119.

Q: Luisa drives 10 miles to the grocery store, 6 miles to the mall, 5 miles to the pet store, then 9 miles back home. One gallon of gas can be used to drive 15 miles. If one gallon of gas costs $3.50, what is the total cost of the gas for Luisa's entire trip?
A: Luisa drives a total of 10 + 6 + 5 + 9 = 30 miles. Luisa uses 30 / 15 = 2 gallons of gas for her trip. The total cost of the gas for Luisa's trip is 2 * $3.50 = $7. The answer is 7.

Q: Karen is considering her winter coat options. One coast costs $300 and will last for 15 years. The other coat costs $120 and will last for five years. How much money would Karen save over 30 years by buying the more expensive cost?
A:
First find the number of cheaper coats Karen will have to purchase over 30 years: 30 years / 5 years / coat = 6 coats. Then multiply that number by the cost of one cheaper coat to find the total cost of that option: 6 coats * $120 / coat = $720. Then find the number of more expensive coats Karen will have to purchase over 30 years: 30 years / 15 years / coat = 2 coats. Then multiply that number by the cost of one expensive coat to find the total cost of that option: 2 coats * $300 / coat = $600. Then subtract the total cost of the more expensive coats from the total cost of the less expensive coats to find the difference: $720 - $600 = $120. The answer is 120.