At a college production of a play, 400 tickets were sold. the ticket prices were $8, $10, and $12, and the total income from ticket sales was $3660. how many tickets of each type were sold if the combined number of $8 and $10 tickets sold was 7 times the number of $12 tickets sold?

Can somebody me out with this question

Answer soon(fast) 15 pts-brainliest? for right answer with small explination a restaurant catered a party for 40 people. a child’s dinner (c) cost $11 and an adult’s dinner (a) cost $20. the total cost of the dinner was $728. how many children and adults were at the party? use the table to guess and check.(i couldn't get the graph onto the question)                                8 children and 32 adults9 children and 31 adults10 children and 30 adults12 children and 28 adults

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?