Question

bruno bought 3 cases of water for a party. guests used 9 bottles of water from each case. write and solve an equation to find how many bottles of water were initially in each case if there were 21 bottles left over

Answer 1

You would take 9x3 and get  27 and then add that to 21 which is 48 and then divide 48 by 3 and get  16 so 16in each case 

Answer 2

Your answer is 16in per case Hope this help.