Question

My friend bought some skateboards for $195. He sold them for $770 making $25 profit on each skateboard. How many skateboards were there?

Answer 1

number of boards ---- x
cost price per board = 195/x
selling price per board = 770/x

770/x - 195/x = 25
575/x = 25
25x = 575
x = 23