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The related link describes a 100 volt source driving three unknown resistors in series, with a fourth resistor of 10 ohms in parallel with one of the three resistors. It is stated that the voltage across the 10 ohm resistor is 20 volts. By Ohm's Law, current is voltage divided by resistance, so the current through the 10 ohm resistor is 2 amperes.
Since you were provided with the voltage across the 10 ohm resistor, it does not matter what the value of the other three resistors is.
However, and this is important to note... The voltage source and three resistors are not shown with any kind of connection to ground, so the circuit, as drawn, is invalid. Nevertheless, the voltage stated across the 10 ohm resistor was 20 volts, so there must be some kind of connection, and that was the basis for the calculation above.
If, on the other hand, the 20 volts is referenced to the voltage source, then the current from A to B is zero, because there is no circuit involving the 10 ohm resistor.
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