Question

On a backpacking trip through Europe, Troy spent 20 Swiss francs to stay one night in a youth hostel. If the foreign exchange rate between the U.S. dollar and the Swiss franc is 1:2.2, how much did Troy spend in U.S. dollars?

Answer 1

On a backpacking trip through Europe, Troy spent 20 Swiss francs to stay one night in a youth hostel. If the foreign exchange rate between the U.S. dollar and the Swiss franc is 1:2.2, how much did Troy spend in U.S. dollars?

Answer 2

If we let x be how much Troy spent in US dollars, and the ratio between the US dollar and the Swiss franc is 1:2.2, then, it should be proportional to x : 20

1:2.2 :: x:20
Can you do it from here?

Answer 3

By the way, the proportion could also be written
\[\frac{1}{2.2} = \frac{x}{20}\]

Answer 4

So just find x :)

Answer 5

Tanya wants to order 50 pizzas for a party. However, the pizza supplier can deliver only 45 pizzas on the given date. How will you describe the relationship between demand and supply of pizzas?

Answer 6

Relationship between the <something> and the <some other thing> is basically just screaming
RATIO!

so all you have to do is get what you want the relationship to be about and put them in the form
a : b, and reduce it to lowest term as you would a fraction