The equation represents the volume of the solid, in terms of its width is Option (C) 80w.
How to find the volume of rectangular solid in terms of width ?
Given that volume, V, of a rectangular solid is found using the equation V = lwh, where l is the length, w is the width, and h is the height of the solid.
Given also that a rectangular solid has length of 16 and height of 5.
Simply putting the values of length and width in the equation of volume, we have -
  V = l*w*h
⇒ V = 16*w*5
⇒ V = 80w
Thus the equation represents the volume of the solid, in terms of its width is Option (C) 80w.
To learn more about volume of solids, refer -
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