Ali turned 8 years old this year, and is now 3 years older than Yusaf. If Umar is twice Yusaf's age, how old is Umar? Give the rationale and then the answer.
Let's think step by step. If Ali is 3 years older, then Yusaf must be 8 3 = 5 years old. Umar is twice Yusaf's age, so he must be 5 * 2 = 10 years old.. The answer is: 10.

Julio makes a mocktail every evening. He uses 1 tablespoon of lime juice and tops with 1 cup of sparkling water. He can usually squeeze 2 tablespoons of lime juice per lime. After 30 days, if limes are 3 for $1.00, how much will he have spent on limes? Give the rationale and then the answer.
Let's think step by step. He uses 1 tablespoon of lime juice per drink so over 30 days that's 1 * 30 = 30 tablespoons of lime juice. He can get 2 tablespoons of lime juice per lime and he will use 30 tablespoons of lime juice so he will need 30 / 2 = 15 limes. The limes are 3 for $1.00 and he needs 15 limes so that's 15 / 3 = $5.00.. The answer is: 5.

Marly is making soup. He adds 2 quarts of milk and three times as much chicken stock to 1 quart of pureed vegetables. Then he divides the soup into bags that can hold 3 quarts each. How many bags does he need? Give the rationale and then the answer.
Let's think step by step. First triple the amount of milk to find the amount of chicken stock: 2 quarts * 3 = 6 quarts. Then add all three quantities to find the total volume of the soup: 6 quarts + 2 quarts + 1 quart = 9 quarts. Finally, divide the number of quarts by the number of quarts per bag to find the number of bags needed: 9 quarts / 3 quarts / bag = 3 bags.. The answer is: 3.