Let g and b represent the numbers of grandstand and bleacher tickets sold. .. g + b = 5716 . . . . . . . . . total number of tickets sold .. 65g +40b = 341690 . . value of tickets sold
Using the first equation .. g = 5716 -b Sustituting into the second equation .. 65(5716 -b) +40b = 341690 .. -25b + 371540 = 341690 . . . . . collect terms .. -25b = -29850 . . . . . . . . . . . . . . subtract 371540 .. b = 1194 . . . . . . . . . . . . . . . . . . . . divide by -25