RCC Structures Design
Based on punching shear consideration, the overall depth of a combined footing under a column A, is

None of these
(Area of the column A × Safe punching stress)/Load on column A
(Perimeter of column A × Safe punching stress)/(Load on column A × Upward pressure × Area of the column)
(Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)

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RCC Structures Design
According to I.S. : 456, slabs which span in two directions with corners held down, are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip, is

Three-fourth of the width of the slab
Half of the width of the slab
Two-third of the width of the slab
Four-fifth of the width of the slab

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