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Andy, Bertha and Chris each have a deck of 52 cards. They all have some cards face up and some cards face down. The number of cards Andy has face up is ten more than the number of cards Bertha has face down. The number of cards Bertha has face up is twice the number of cards Chris has face down. The total number of face-up cards is 99. How many cards does Andy have face up?
Ants have six legs, spiders have eight legs, and dogs have four legs. There are 37 ants, spiders, and dogs in a room, and they have a total of 208 legs. There are four more dogs than ants. How many spiders are there?
I start with 10 quarts of a 10% solution of antifreeze. How much pure (100%) antifreeze do I need to add to end up with a 20% solution?