Estimating and Costing
Pick up the correct statement regarding the centre line method of estimating a building

Product of the centre line of the walls and area of cross-section of any item, gives total quantity of the item
All of these
The centre line is worked out separately for different sections of walls of a building
The centre line length is reduced by half the layer of main wall joining the partition wall

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Estimating and Costing
In the mid-section formula

The volume of the earth work is calculated by multiplying the mid-section area by the distance between the two original sections
The area of mid-sections is calculated by using mean depth
All of these
The mean depth is the average of depths of two consecutive sections

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