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Featured Pro Problems
Hermie the Elf goes Christmas shopping, but all he has is coins in his pocket
How much money would the Kranks have saved if they'd skipped Christmas altogether?
A system of equations in five unknowns - find how many bubbles were blown
How many people are there at my family's Thanksgiving gathering?
A system of equations involving people buying Christmas gifts for each other
An algebra problem involving four people picking apples at an orchard
A word problem involving all the letters of the alphabet as variables
Calculate the sum of four variables, given a system of three equations with four variables
Full Directory ListingA Kranky Christmas, All the Letters, Blowing Bubbles, Buying Christmas Gifts, Four Unknowns, Three Equations, Hermie goes Christmas Shopping, Picking Apples, Thanksgiving Family Gathering
Understanding Coronavirus Spread
A Question and Answer session with Professor Puzzler about the math behind infection spread.
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