Respuesta :

notrnick
$2.56 * 15 gallons = $38.4 (total)

2 person split = $38.4 / 2 = $19.2/person


another friend = +1
$38.4 / 3 = $12.8

each person saves = $19.2 - $12.8 = $6.4/person

i hope this helps :)

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