Question: Karen is a dog groomer. Rottweilers take 20 minutes to groom, border collies take 10 minutes to groom, and chihuahuas take 45 minutes to groom because they ferociously resist. How many minutes will it take Karen to groom 6 Rottweilers, 9 border collies and 1 chihuahua?
Answer with step-by-step thinking: First find the total time Karen spending grooming Rottweilers: 20 minutes / Rottweiler * 6 Rottweilers = 120 minutes. Then find the total time she spends grooming border collies: 10 minutes / border collie * 9 border collies = 90 minutes. Then add the time spent grooming all three kinds of dogs to find her total grooming time: 120 minutes + 90 minutes + 45 minutes = 255 minutes.
So the answer is 255.

Question: In the second hour of a storm it rains 7 inches more than twice the amount it rained the first hour. The total amount of rain in the first two hours is 22 inches. How much did it rain in the first hour?
Answer with step-by-step thinking: Let x be the amount of rain in the first hour. It rained 2x + 7 inches in the second hour. x + 2x + 7 = 22. 3x + 7 = 22. 3x = 15. x = 5 inches.
So the answer is 5.

Question: Josh went to the shopping center. He bought 9 films and 4 books. He also bought 6 CDs. Each film cost $5, each book cost $4 and each CD cost $3. How much did Josh spend in all?
Answer with step-by-step thinking:
The cost of the films is 9 $5 = $45. The cost of the books is 4 $4 = $16. The cost of the CDs is 6 $3 = $18. Josh spent $45 + $16 + $18 = $79 in total.
So the answer is 79.