Question

If 1 japanese yen equals 0.0079 euros, then 1 euro equals approximately how many japanese yen?

Answer 1

we know that

applying a rule of three
if 1 japanese yen -------------> equals 0.0079 euros
  X  japanese yen--------------> 1 euro
x=[1 euro]*[1 japanese yen]/[0.0079 euros]------------> 126.58 japanese yen

the answer is 
126.58 japanese yen