You'd multiply the amount of string for each balloon (12 feet) by the 54 balloons he needs, and you get 648 feet. There are 3 feet in a yard so then you would divide 648 by 3 and get 216 yards
First you have multiply 6 by both 3x and 8 6*3x = 18x 6*8= 48 18x + 48 + 32 + 12x now combine like terms 18x + 12x = 30x 48 + 32 = 80 so 30x + 80 is your answer
