the blue box contains about 3,000 while the yellow box contains 4,000 because by subtracting 6284 from 873 you will get an estimate of 5411 then if you divide by 2 it will equal to 2705.5 then adding 873 again you would receive 3,578.5 then estimate it to get 4,000 than do the same to 2705.5 which will give u the answer.
