Question 160423
"311 Tickets sold" __ s+n=311 __ s=311-n


"a total of 385.50" __ .50s+1.50n=385.50 __ s+3n=771


substituting __ (311-n)+3n=771 __ 2n=460 __ n+230


substituting __ s+(230)=311 __ s=81