An investor invested a total of $1,800 in two mutual funds. One fund earned a 6% profit while the other earned a 3% profit. If the investor’s total profit was $99, how much was invested.

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?