A group of ten people were planning to chip in equallyto buy several pizzas. After the pizzas were ordered, one person left. As a result, each of the remaining nine people had to pay an extra 60 cents. How much was the total bill?
original = p cents / pizza
10 p = total cost
9(p+60) = same total cost
so
10 p = 9(p+60)
p =540 cents = 5.40 per pizza
so
$54