Fraction alert! to make dough, reba needs 2 and 1/2 cups of flour. how much flour does she need to make 5 batches of dough? plz !

Mark, taylor, & brian's ages are consecutive whole numbers. mark is the youngest, and brian is the oldest. the sum of their ages is 111. how old is mark? a) 34 years old b) 35 years old c) 36 years old d) 37 years old