Suppose 8x+16 ice cream cones were sold on Saturday and 7x-9 cones were sold on Sunday. What is the total number of ice cream cones sold? Write an expression and then simplify it.

During the election for class president, 40% of the students voted for kellen, and 60% of the students voted for robbie. 500 students voted in total. how many more students voted for robbie than for kellen? answer with work : )