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Batteries in parallel

I want to know how we can find out the net voltage of a circuit where two batteries with different voltages are connected in parallel... Let's consider the problem stated below...

If I have a circuit where there are 2 batteries in parallel(5V & 15V)... And it is connected in series with another 10V battery... Each battery has an internal resistance of 1 ohm... (The batteries are rechargeable so current can flow either way through them)

What is the net emf in this circuit?

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