Let x be the number of newspapers John delivers in a day (the value under the question). Then Bob delivers (x-9) newspapers. The condition says 7*(x + (x-9)) = 861. Simplify and solve for x : 7x + 7x - 63 = 861 14x = 861 + 63 14x = 924 x == 66. ANSWER. John delivers 66 newspapers per day.