Patty decides that to convince her brother and sister to do her chores in exchange for cookies. Patty agrees to give them 3 cookies for every chore they do. Each kid normally has 4 chores to do per week. Patty has $15 to buy cookies. Each pack of cookies contains 24 cookies and costs $3. How many weeks can Patty go without doing chores by paying her siblings with cookies? Give the rationale and then the answer.
Let's think step by step. Patty can buy 5 packs of cookies because 15 / 3 = 5. Patty gets 120 cookies because 5 x 24 = 120. Patty would need to pay 12 cookies per week because 3 x 4 = 12. Patty can avoid 10 weeks of chores because 120 / 12 = 10.. The answer is: 10.

Greta worked 40 hours and was paid $12 per hour. Her friend Lisa earned $15 per hour at her job. How many hours would Lisa have to work to equal Greta's earnings for 40 hours? Give the rationale and then the answer.
Let's think step by step. For the 40 hours worked, Greta earned a total of 40 * 12 = $480. To find how many hours Lisa has to work to earn $480, we divide 480 / 15 = 32.. The answer is: 32.

Nadia walked 18 kilometers, which was twice as far as Hannah walked. How many kilometers did the two girls walk in total? Give the rationale and then the answer.
Let's think step by step. Hannah = (1 / 2) 18 = 9. 9 + 18 = 27 km. Together they walked 27 kilometers.. The answer is: 27.