 
<translate> A shekara ta 2005, yara 30 suka zo wurin bikin. A shekara ta 2006, 30 / 3 * 2 = yara 20 sun zo wurin dafa abinci. Saboda haka, amsar ita ce 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. 