If the neutral axis of a T-beam is below the slab, the relationship between the flange width B, depth of neutral axis n, thickness of the slab A, and the modular ratio m may be stated as

- 1
  
  $B d s (n - \frac{d s}{2}) = m A t (d + n)$
- 2
  
  $B d s (n + \frac{d s}{2}) = m A t (d - n)$
- 3
  
  $B d s (n - \frac{d s}{2}) = m A t (d - n)$
- 4
  
  $B d s (n - d s) = m A t (d - n)$

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