I need to put a 20 ohm resistor for the AMC7135. Does this mean that I can put two 10 ohm resistors in parallel? Do they add up as R(t) = R(1) + R(2) (As though they were in series), or do they add up as 1/R(t) = 1/R(1) + 1/R(2)?

If the former was true, then putting two 10 ohm resistors in parallel would equal 20 ohms. Otherwise, I need to put two 40 ohm resistors in order to get a total of 20 ohms.

Your help is definitely appreciated.