Let x be the number of children tickets. Then the number of adults tickets is 2x, according to the condition. The money equation is 8*(2x) + 4x = 160 dollars. 16x + 4x = 160 ====> 20x = 160 ====> x == 8. Answer. 8 children tickets and 8*2 = 16 adults tickets. Check. 8*4 + 16*8 = 160 dollars. ! Correct !