Number of calories consumed on Monday = 2161
Number of Calories consumed on Tuesday = 2378
Number of Calories consumed on Wednesday = 1841
Daily average intake is 2200
Let calories intake on Thursday be X
Now ,
Average = sum of total calories/ number of calories
=> 2200 = 2161+2378+1841+X/4
=> 2200 x 4 = 6377 + X
=> 8800 = 6377 + X
=> X = 8800-6377
=> X = 2423
So Samuel must consume 2423 calories on Thursday