“In the Circuit Shown in the Figure, Find the Total Resistance of the Circuit and the Current in the Arm AD”

In the picture, how are they getting the current answer? I don't get it. Which method is that?

Dear student

Addressing current in the branch issue

Total current = 3 amp ie sum total of currents from both the paths ABCD AND AD

Here they have used shortcut ie current in larger resistance will be less as compared to current in other and it will be divided in proportion of " opposite resistance to that of total "

You can solve or get the idea by applying nodal equations or mesh equations

Regards