let 'x' represent the amount at 12% interest, then '140000-x' represents the amount of 9% interest
interest = principal * rate * time
we assume time to be equal to 1
14850 = 0.12x + 0.09(140000-x)
solving for 'x' we have x=75000
140000-75000 = 65000
Ralph needs a note for $75,000 at 12% interest and a note at $65,000 at 9% interest