Fix grammar in currency-exchange hint #3529
Merged
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This is a tiny thing, and it probably wouldn't confuse people who are
actually doing the exercise.
I came across it because I was doing a full audit of instances where
we say 'amount of ...' since there were several instances where it
should have been 'number of ...'.
At first I thought this was supposed to be 'number of changes', but
then in the context of the exercise it turns out that it was a
different problem entirely :)