350, 345, 270, 345, 340, 270 is correct.
'Each leg' refers to each LED/resistor combo.
You know the current flowing through each leg. 20mA. Since you also know the voltage drop over each LED, i.e. 2.0V for the first one, you know the voltage across each resistor, i.e. 9V-2V = 7V
Ohm's law...