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The question is: What are the values of I1, I2, and I3 in the circuit?

The ciruit looks like this:

20.0V I=positive terminal

|-------I|-------|

| |

A I1 A I3

| |

| |

/ R1 |

\ 6.0? |

/ |

\ |

| |

|----v^v^v----|

| R2 2.0? A I2

| |

|----v^v^v----|

R3 4.0?

A = Ammeter

Okay. I have no difficulty finding the amount of current at points I1 and I3, as they are equal, and they both work out to 2.7A.

The difficulty lies in finding I2. The answer according to the book is 0.90 A and no matter how hard I try and how many routes i take to get there, I always wind up with the wrong answer. I'm beginning to think perhaps it's that the book's answer is wrong because the most logical answer I got was 1.0 A.

Any help would be nice! Thanks!