Zach baked cookies for a bake sale. On Monday he baked 32 cookies. On Tuesday he ran out of sugar and could only bake half of the number of cookies he baked the day before. On Wednesday he baked three times the number of cookies he did on Tuesday, but his brother ate 4 of those cookies. How many cookies did he have at the end of the three days? Let's be accurate as possible.
On Tuesday he made 32 / 2 = 16 cookies. On Wednesday he made 16 * 3 = 48 cookies. Before his brother ate some he had 32 + 16 + 48 = 96 cookies. After his brother ate some he had 96 - 4 = 92 cookies.
The answer: 92.