Walrus, it would be 20, see the formula below.

Using 20 amps on A and B;

sqrt of (IA^2 + IB^2) - (IA x IB)

(IA^2 + IB^2) - (A x B)
20x20 + 20x20 - 20 x 20
400 + 400 - 400
800 - 400 = 400

sqrt of 400 = 20


Roger