A 25 ft x 100 ft rectangular swimming pool is to be constructed so that its maximum depth is 4 times its minimum depth. (See figure.) 
Which of the following is an expression for the volume of the pool? (Hint: Consider the figure as a composite with the top as a rectangular box and the bottom as one half of another rectangular box.)
A. 25 ? 100 ? d
B. 25 ? 100 ? 4d - 25 ? 100 ? d
C. 
? 25
D. 25 ? 100 ? d + 
? 25
E. none of these
Answer: D
Mathematics
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