The questions are unlilkely to stay the same...
I assume you are talking about getting a question like "You have £314, how much is that worth in Euros? The Exchange rates are $1.7 to the Pound and €0.75 to the Dollar"
The answer is simple; You know how many euros there are to a dollar and you know how many pounds there are to a dollar. All you need to do is convert your pounds into dollars then from dollars into euros.
£314 is about $534 (314 x 1.7)
$534 is about €400 (534 x 0.75)
so £314 is about €400