Let x be the number of child tickets; then the number of adult tickets is 142-x. Now write the total money equation 5.30x + 9.50*(142-x) = 1084.40 dollars. Simplify and find x 5.30x + 9.5*142 - 9.50x = 1084.40 5.30x - 9.50x = 1084.40 - 9.5*142 -4.20x = -264.60 x == 63. ANSWER. 63 child tickets.