The 10 V is applied across each of the resistors.
I1 = V/R1 = 10/250 = 0.04 A
I2 = V/R2 = 10/3330 = 0.003 A

There are two ways to find I3:
1. As above, I3 = V/R3 = 10/167 = 0.06 A
Note: 0.04 + 0.003 + 0.06 = 0.103 as it should.

2. Knowing that the current is conserved:
I3 = I - I1 - I2 = 0.103 -0.04 - 0.003 = 0.06 A

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