Kaiden and Adriel were to pick a certain number of apples from their farm. After picking 400 apples each, they realized they still had to pick some more, so each picked 3/4 times as many as they had picked earlier. When they checked the pickup truck that was carrying the apples, they found out they still needed to pick 600 apples each to reach the target number. How many apples were they targeting to pick? Let's think first. Chain of thought:
When they picked 400 apples each in the first round, they picked a total of 2 * 400 = 800 apples. They picked 3 / 4 * 400 = 300 apples each in the second round. The total number of apples they picked in the second round is 2 * 300 = 600. The total number of apples they'd picked so far is 800 + 600 = 1400. When they checked the pickup truck that was carrying the apples, they found out they still needed to pick 600 apples each to reach the target number, a total of 2 * 600 = 1200. The target number of apples they had to pick is 1200 + 1400 = 2600.
Therefore, the answer is 2600.