The distance between a food bank and a church is approximately 8.0 x 10^5 inches. Which of the following is closest to the distance between the food bank and the church, in kilometers? (1 kilometer is approximately 3.9 x 10^4 inches.)  Choose the correct choice from the following choices
A) 22.8  B) 23.4  C) 19.86  D) 20.5  E) 23.9
We know that 1 kilometer = 3.9x10^4 inches. Therefore, we now have a ratio of (1 kilometer/3.9x10^4 inches).   We also know that the distance between the food bank and the church is approximately 8.0x10^5 inches. To convert inches to kilometers, we need to multiply 8.0x10^5 inches by the ratio we just found out.   kilometers = 8.0x10^5 inches x (1 kilometer/3.9x10^4 inches) [note: "inches" cancel out, leaving us with just km]   km = 8.0x10^5/3.9x10^4 km   km = 20.51 = 20.5 km   Therefore, we can see that the closest answer is 20.5.
<result>D</result>
The distance between a food bank and a church is approximately 8.0 x 10^5 inches. Which of the following is closest to the distance between the food bank and the church, in kilometers? (1 kilometer is approximately 3.9 x 10^4 inches.)