Bag of peanuts

Joe eat 1/3 of a bag of peanuts, mark eat 1/4 of the remaining in the bag of peanuts, Alvin eat 1/2 of the remaining bag of peanuts, peter eat 10 peanuts, there are 71 peanuts left. Hon many peanuts were in the bags?

Correct result:

n =  324


n/3 + 1/4 • (n-n/3) + 1/2•(n-(n/3 + 1/4 • (n-n/3))) + 10 + 71 = n

3n = 972

n = 324

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