Write an expression that represents “one-half of x”​

Need this at the city museum, child admission is 6 and adult admission is 9.20. on tuesday, 132 tickets were sold for a total sales of 961.60. how many adult tickets were sold that day?

Will mark brainliest! ( explain the answer too, it can be one sentence)

Felix wrote several equations and determined that only one of the equations has no solution. which of these equations has no solution?