RCC Structures Design
If the modular ratio is ‘m’, steel ratio is ‘r’ and overall depth of a beam is ‘d’, the depth of the critical neutral axis of the beam, is

[m/(m - r)] d
[(m + r)/m] d
[(r - m)/m] d
[m/(m + r)] d

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RCC Structures Design
A pre-stressed concrete member is preferred because

Large size of long beams carrying large shear force need not be adopted
All listed here
Its dimensions are not decided from the diagonal tensile stress
Removal of cracks in the members due to shrinkage

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