I wonder also about question e her. The professor is saying that we need $10$ NOK to purchase one USD. Which means that NOK$/$USD$=10\mathrm{.}00$ because for each USD you get $10$ NOK In the rest of the questions he is saying that we need $11$ NOK to purchase one GBP$.$ Which means that NOK$/$GBP$=11$ because for each GBP you get $11$ NOK When we are trying to find GBP$/$USD arent we suppose to divide $11($NOK$/$GBP$)/10($NOK$/$USD$)?$Since if we do that, the answer would be for each USD we get x amount of GBP$.$As I have understood so far is when you have for example NOK$/$USD$=9\mathrm{.}00$ that means that for one USD you get $9\mathrm{.}00$ NOK. Like $1$ USD $=9\mathrm{.}00$ NOK.Could you please explain to me this and eventually why its wrong, since it seems that my thinking is wrong. I want to understand why so when I to problem sets or examples and know why it is like that.