Food for one (person) suffices two, and food for two (persons) suffices four persons and food for four persons suffices eight persons.
عَنِ النَّبِيِّ ﷺ قَالَ طَعَامُ الرَّجُلِ يَكْفِي رَجُلَيْنِ وَطَعَامُ رَجُلَيْنِ يَكْفِي أَرْبَعَةً وَطَعَامُ أَرْبَعَةٍ يَكْفِي ثَمَانِيَةً