Question

what is the total current in the circuit

Answer 1

A parallel circuit has two or more paths for current to flow through. Voltage is the same across each component of the parallel circuit. The sum of the currents through each path is equal to the total current that flows from the source.
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Answer 2

1/Rp=1/15+1/10+1/3

1/Rp=2/30+3/30+10/30

1/Rp=15/30

Rp=30/15=2ohm

1/Rp2=1/12+1/4

1/Rp2=1/12+3/12

1/Rp2=4/12

Rp2=12/4=3ohm

Rs=Rp+Rp2

Rs=2+3=5ohm

Total resistance in the circuit is 5ohm

I=V/R

I=15/5=3A