<human>:  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?
<bot>: How much did Mary spend on a new video game? ** Mary spent 100/4= <<100/4=25>>25 dollars on a new video game.
How much money did Mary have left after the video game purchase? ** So, after the video game purchase, Mary was left with 100 - 25 = <<100-25=75>>75 dollars.
How much did Mary spend on swimming goggles? ** Mary then bought swimming goggles for 75/5 = <<75/5=15>>15 dollars
How much money did Mary have left? ** Mary had 75 - 15 = <<75-15=60>>60 dollars left
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