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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 !