?Suppose the inner cone of a flame produces 430 Btu per cubic foot of gas, and the outer envelope produces 610 Btu per cubic foot of gas. What is the total heat produced by the flame?
A. ?520 Btu per cubic foot
B. ?1040 Btu per cubic foot
C. ?1220 Btu per cubic foot
D. ?262,300 Btu per cubic foot
Answer: B
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