Assume that the volume of the prism, V prism = Area of the base (A) x height (h). Using the equation for solving the volume of pyramid which is V pyramid = 1/3 x (base x height). For this example the prism and the pyramid's base is equal (A) and the height of pyramid is half the height of the prism (h/2). Hence, volume pyramid = 1/3 x (A) x (h/2) = (A x h)/6.
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He sold 8 and 4/20 boxes
he solde 8 and 1/5 boxes
he sold 8(20)+4 or 160+4 or 164 candy bars