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The maximum safe load of a beam varies jointly with its width and the square of its depth. If a beam that is 20 cm wide and 16 cm deep can carry a maximum load of 25 600 g, find the maximum safe load, in kilograms of a beam that is 15 cm wide and 15 cm deep. Express your answer to the nearest kilogram.

a. 168kg
b. 1688kg
c. 17kg
d. 169kg​