How Do Cells with Different EMFs Combine in a Circuit?

[vimalviswam]

Homework Statement

CELLS OF EMFS E1 ,E2,E3...HAVING INTERNAL RESISTANCES r1,r2,r3...are connected to an external resistance R.What is the resultant emf?

Homework Equations

The Attempt at a Solution

 

[buffordboy23]

How is the circuit constructed? Are all of the components in series? You need to be more descriptive with the problem statement and show some effort for why you are stuck if you expect anyone on this forum to make an effort to assist you.