Calculating current in circuit

The voltage is the same for all parallel resistors.

Use Ohms Law for the network where V =I xR .....
I is given
and the combined resistance R is found by 1/R =1/R1+1/R2+1/R3

Once you get V, apply Ohms Law using that V, to each single resistor
e.g, e.g. V=I1xR1

Still I can't figure out how to calculate exactly what I3 equals. I know it's divided between I2 and adds up to 900mA but how do I calculate it
Thanks

V= VT = V3

R2 and R3 are in parallel with respect to 900ma.....not R1 as suggested in my first answer.

So V=.009 x R2R3/(R2+R3)

I3 =V/R3

Thank you man