 
<translate> N'afọ 2005, ụmụaka 60 / 2 = 30 bịara oriri ahụ. N'afọ 2006, ụmụaka iri abụọ bịara oriri ahụ. N'ihi ya, azịza ya bụ 20. <eng> In 2005, 60 / 2 = 30 kids came to the cookout. In 2006, 30 / 3 * 2 = 20 kids came to the cookout.
Thus, the answer is 20. 