Chapter 5 Polynomials and Polynomial Functions - 5.4 Factor and Solve Polynomial Equations - 5.4 Exercises - Problem Solving - Page 358: 60c

See below.

From part b) the equation is: $80x^3=1250\\x^3=\frac{125}{8}\\x=\frac{5}{2}=2.5$ Thus the dimensions of the green level: height: $2.5$, width: $10$, length: $5$. Thus the dimensions of the red level: height: $2.5$, width: $15$, length: $10$. Thus the dimensions of the blue level: height: $2.5$, width: $20$, length: $15$.