I had $30 in allowance money and spent it as indicated in the pie graph shown. How many dollars did I spend on burgers? https://latex.artofproblemsolving.com/f/1/d/f1d49c8c9298ae15b79b629dc2862339b5fe2a11.png

Add the fractions

1/3 + 3/10 + 1/5 =

10/30 + 9/30 + 6/30 = 25/30 = 5/6 spent on eveything else but the burgers

So 1/6 of the circle is the fraction of $30 spent on the burgers = (1/6 ) (30) = $5 on burgers