Are you sure on that question 19 20 and 30 resistors are connected in parallel to each other?

The $20 \, \Omega$ resistor and the $30 \, \Omega$ resistor are connected in parallel.

Here's why:

• Current flows from the $10 \, \Omega$ resistor and reaches a junction (point X).
• At this junction, the current splits, with one part flowing through the $20 \, \Omega$ resistor and the other part flowing through the $30 \, \Omega$ resistor.
• These two currents then recombine at another junction (point Y) before continuing through the rest of the circuit.
• This splitting and recombining of current, where the components share the same voltage across them, is the defining characteristic of a parallel connection.