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Joey Chestnut is trying to break his own world record for eating the most hot dogs and buns in 10 minutes. He needs to eat more than 72 hot dogs to break his record. After 1 minute of competition, Joey has eaten 10 hot dogs. Joey wants to know the number of hot dogs per minute that he needs to eat for the next 9 minutes to break his own record.

Answer :

ErikEvilone
before we start the math you must know that he is trying to beat his record so we cant do 72-10 lets do 73 instead because that is the least he can eat to beat his record so first do 73-10 that is 63 now he only has 9 min left to eat 63 more hot dogs just do 63/9 and that gets you 7 he must eat at least 7 hot dogs every min for 9 min to beat his record 

Answer From Khan Academy:

11 1/4+9d >72

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