Q: Susie has $200 in her piggy bank. If she puts 20% more money into her piggy bank, how much money she will have?
A: If Susie puts 20% more money into her piggy bank, she'll have 20 / 100 * 200 = $40 more in her piggy bank. The total amount of money in Susie's piggy bank will increase to $200 + $40 = $240. The answer is 240.

Q: 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?
A: 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.

Q: On a three-day trip, Wendy drove 125 miles on the first day, and 223 miles on the second day. How many miles did she drive on the third day, if the total miles that Wendy drove for the trip is 493 miles?
A:
Wendy drove 125 miles + 223 miles = 348 miles on the first two days. So on the third day, she drove 493 miles - 348 miles = 145 miles. The answer is 145.