To find how much money Jaden will earn for 4 lawn-mowing jobs and 6 pulling-weeds jobs, we substitute l=4 and w=6 into the expression 25l+20w:
25(4) + 20(6) = 100 + 120 = <<25*4+20*6=220>>220
Therefore, Jaden will earn $220 for 4 lawn-mowing jobs and 6 pulling-weeds jobs. Answer: \boxed{220}.