A cake has 8 slices and each slice contains 347 calories. A pan of brownies has 6 brownies and each slice contains 375 calories. How many more calories does the cake have?
Let's think: The cake has 8 slices * 347 calories = 2776 calories. The brownies have 6 slices * 375 = 2250 calories. The cake has 2776 calories - 2250 = 526 more calories.. The answer is: 526.

Brittany uses 1/4 ounce of shampoo to wash her hair every other day. She buys shampoo in 14-ounce bottles. How many bottles does she need to get her through a leap year?
Let's think: A leap year is one day shorter than a regular year, so it is 365 – 1 = 364 days. Brittany washes her hair every other day, so she will wash it 364 / 2 = 182 times in a leap year. A bottle of shampoo lasts her 14 / 1 / 4 = 14 * 4 = 56 washes. If she buys 3 bottles, she will only have enough for 56 * 3 = 168 washes. If she buys 4 bottles, she will have enough for 56 * 4 = 224 washes. Since 168 < 182 and 224 > 182, Brittany needs 4 bottles of shampoo to get her through a leap year.. The answer is: 4.

Sean needs to replace 2 light bulbs in his bedroom, 1 in both the bathroom and the kitchen and 4 in the basement. He also needs to replace 1/2 of that amount in the garage. The bulbs come 2 per pack. How many packs will he need?
Let's think: He needs to replace lights in the bedroom, bathroom, kitchen and basement so 2 + 1 + 1 + 4 = 8 lightbulbs. In the garage, he needs to replace half that amount so he needs 8 / 2 = 4 lightbulbs. All total, he needs 8 + 4 = 12 light bulbs. They come 2 per pack and he needs 12 lightbulbs so he needs 12 / 2 = 6 packs of lightbulbs.. The answer is: 6.

On Mary's birthday, her brother surprised her with $100. She spent a quarter of it on a new video game and then used a fifth of what was left on swimming goggles. How much money did she have left?
Let's think:
Mary spent 100 / 4 = 25 dollars on a new video game. So, after the video game purchase, Mary was left with 100 - 25 = 75 dollars. Mary then bought swimming goggles for 75 / 5 = 15 dollars. Mary had 75 - 15 = 60 dollars left.. The answer is: 60.