Arithmetic

An explorer is going on a 10 day march. He is hiring bearers to carry food and supplies for him. Each person including himself can carry food and supplies of one man for 6 days. Bearers will die if they don’t have enough food and supplies on their way back.
How many bearers does Burton need if he’s to complete his march and the bearers are to return safely?
a) 3
b) 4
c) 5
d) 8
e) more than 8 

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