A shop sells 5 types of rulers and 4 types of erasers. In how many ways can you buy a set consisting of one ruler and one eraser?

A shop sells 4 types of balloons: red, blue, yellow, and green. In how many ways can you buy a set of two balloons of different colours?

Before noon, a café offers a “Light Breakfast” set consisting of one drink and one pastry: a bun, a vatrushka, or a pie. The café has 7 different drinks. How many different “Light Breakfast” sets are possible?

When buying a new car model, you can choose the body colour — 5 options — and the wheel type — alloy or stamped. How many different “colour + wheels” configurations are there?

In a pizzeria, you can order a Margherita pizza with two extra toppings chosen from five offered toppings (olives, mushrooms, peppers, ham, pear). How many different pizzas can be ordered?