Chapter 2 - Equations, Inequalities, and Problem Solving - Review Exercises: Chapter 2 - Page 149: 27

$B=\dfrac{3V}{h}$

Using the properties of equality, in terms of $ B $, the given equation, $ V=\dfrac{1}{3}Bh $, is equivalent to \begin{array}{l}\require{cancel} 3V=Bh \\\\ \dfrac{3V}{h}=B \\\\ B=\dfrac{3V}{h} .\end{array}