John chooses a 5-digit positive integer and deletes one of its digits to make a 4-digit number. the sum of this 4-digit number and the original 5-digit number is 52713. what is the sum of the digits of the original 5-digit number?

Arestaurant offers delivery for their pizzas. the total cost the customer pays is the price of the pizzas, plus a delivery fee. one customer pays $23 to have 2 pizzas delivered. another customer pays $59 for 6 pizzas. how many pizzas are delivered to a customer who pays $86?