Respuesta :

W0lf93
The concept that can be used in order to determine the answer to this item is that of equating the man-hours for each walls.

Case 1:  (36 minutes)(7people) / 4 walls

Simplifying,
                 63 people-minutes/wall

Using this calculated value for the next case,

                63 people-minutes/wall = (9 people)(x minutes)/7 walls

The value of x from the equation is 49 minutes.

Thus, the answer is 49 minutes.

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