Use LCM/LCD to find the matching equivalent fraction for each of the following: 3/4 2/3 5/6 equal it to 10/12 8/12 9/12

Ahigh definition tv cost $800 with a down payment of 2/5 of the cost. how much is left to pay, in dollars after the down payment has been made?

With number 11 ( show how you got the answer)

Atotal of 766 tickets were sold for the school play. they were either adult tickets or student tickets. there were 66 more student tickets sold than adult tickets. how many adult tickets were sold?