tolipanebas,
You appear to be assuming that the entire resistance in the circuit is due to battery internal resistances. Nothing in your qustions states that this is so.
More importantly it is unrealistic to suggest that we would have a circuit containing nothing but the batteries. Even when conducting capacity testing of batteries, a load is used to cotrol the discharge rate.
I suggest that it also rather improbable that a serviceable battery woould have a 24 ohm internal resistance.
I have (quite reasonably I think) assumed that the circuit included a load. I also ignored the internal resistance of the batteries because in most circuits they are a very small part of the total
The different ways in which we have interpreted this situation illustrates my original comment. If this is a real JAR question then it is a very poor one.