We have a question: Mark goes into the store to buy some groceries. He buys 6 2$ cans of soup, 2 $5 loaves of bread, 2 3$ boxes of cereal, and 2 $4 gallons of milk. When he gets to the register, he opens his wallet to pay and realizes he only has $10 bills in there. How many $10 bills does he need to use to pay?
And an answer: 4
So how you got the answer?
Mark buys 6 $2 cans of soup, meaning he spends 6 * 2 = 12 dollars on soup. Mark buys 2 $5 loaves of bread, meaning he spends 2 * 5 = 10 dollars on bread. Mark buys 2 $3 boxes of cereal, meaning he spends 2 * 3 = 6 dollars on cereal. Mark buys 2 $4 gallons of milk, meaning he spends 2 * 4 = 8 dollars on milk. All added together, this means Mark spends 12 + 10 + 6 + 8 = 36 dollars. Since Mark only has $10 bills, he spends 36 / 10 = 3.6 tens on it, which rounds up to 4 as you cannot spend .6 of an undividable item.

We have a question: Cassie is an athletic person and tries to drink at least 12 cups of water a day to stay hydrated while being active. Her water bottle holds 16 ounces. There are 8 ounces of water in a cup. How many times does Cassie have to refill her water bottle a day to make sure she drinks 12 cups?
And an answer: 6
So how you got the answer?
Cassie needs to drink 8 * 12 = 96 ounces of water to drink 12 cups a day. Thus, Cassie needs to refill her water bottle 96 / 16 = 6 times a day.

We have a question: A company has 200 employees. 60% of the employees drive to work. Of the employees who don't drive to work, half take public transportation. How many more employees drive to work than take public transportation?
And an answer: 40
So how you got the answer?
Drive to work:200(.60) = 120. Don't Drive to work:200 - 120 = 80. Public Transportation:80(.50) = 40 employees. 80 - 40 = 40 employees.