In plain terms:[br][br]Using the same example from the introduction - if we assume that the ratio of lemons to oranges is 1 : 7 then we can say that the number of lemons, when expressed as a fraction, is [math]\frac{1}{7}[/math] the number of oranges. We can also say that the number of oranges, when expressed as a fraction, is [math]\frac{7}{1}[/math] the number of lemons.