In hapter 7 of "Animal Farm", how were the humans tricked into thinking conditions on Animal Farm were better than they really were?please help...

When Mr. Whymper made his weekly visits to the farm, the animals intentionally made things appear better than they were.  For example, "a few selected animals, mostly sheep, were instructed to remark casually in his hearing that rations had been increased" (p. 68).  In another deception, the animals would fill the bins of food with sand, then put food only on the very top of the bin.  This way, the bins would appear to be full of food to last the winter.  For a while, this worked; "he was deceived, and continued to report to the outside world that there was no food shortage on Animal Farm" (p. 68).