Step 1 :Let the number of adult tickets be 4x, child tickets be x, senior tickets be 3y
Step 2 :4x + x + 3y = 72
Step 3 :Since the ratio of adult to senior tickets is 4:3, 4x = 3y
Step 4 :Substitute the value of 4x from the third equation into the second equation and solve for x
Step 5 :Divide 4x by 4 to find the number of adult tickets