After one day of sailing, 2/5*400 = <<2/5*400=160>>160 pounds of food supplies had been used.
The total number of supplies remaining in the ship is 400-160 = <<400-160=240>>240 pounds.
After another 2 days of sailing, 3/5*240 = <<3/5*240=144>>144 pounds of food had been used.
The total number of supplies remaining in the ship is now 240-144 = <<240-144=96>>96 pounds.
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