Q: Trevor's older brother was twice his age 20 years ago. How old was Trevor a decade ago if his brother is now 32 years old?
A: If Trevor's brother is 32 years old today then 20 years ago he was = 32 - 20 = 12 years old. If Trevor's brother was 12 years old and he was twice Trevor's age, then Trevor was 12 / 2 = 6 years old. If Trevor was 6 years old 20 years ago, then he must be 6 + 20 = 26 years old today. If Trevor is 26 years old today then a decade ago he must have been 26 - 10 = 16 years old. The answer is 16.

Q: Maddie went to a beauty store and bought some beauty products. She bought 3 different makeup palettes which cost $15 each, 4 lipsticks which cost $2.50, and 3 boxes of hair color which cost $4 each. How much did Maddie pay in total?
A: She paid 3 x $15 = $45 for the makeup palettes. She paid 4 x $2.50 = $10 for the lipsticks. She also paid 3 x $4 = $12 for the boxes of hair color. Therefore, Maddie paid a total of $45 + $10 + $12 = $67 for the beauty products. The answer is 67.

Q: James takes a spinning class 3 times a week. He works out for 1.5 hours each class and burns 7 calories per minute. How many calories does he burn per week?
A:
He works out for 1.5 * 60 = 90 minutes per class. So he burns 90 * 7 = 630 calories per class. That means he burns 630 * 3 = 1890 calories per week. The answer is 1890.