Suppose that Juliet has CZK 490 to spend on milk and breakfast cereals. One bottle of milk costs CZK 30. Tesco offers a discount on breakfast cereals; the discounted price is CZK 60 for one cereal pack. However, one consumer might buy a maximum of 2 packs for the discounted price. If Juliet buys more, she pays an undiscounted price CZK 80 per pack. Suppose that Juliet buys 4 packs of cereals. How many bottles of milk could she afford to buy then?