The distance between a school and the closest grocery store is approximately 9.2 x 10^4 inches. Which of the following is closest to the distance between the school and the store, in kilometers? (1 kilometer is approximately 3.9 x 10^4 inches.)
Choose one:
A) 2.9
B) 3.2
C) 2.7
D) 2.4
E) 1.9
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 school and the store is approximately 9.2x10^4 inches. To convert inches to kilometers, we need to multiply 9.2x10^4 inches by the ratio we just found out.   kilometers = 9.2x10^4 inches x (1 kilometer/3.9x10^4 inches) [note: "inches" cancel out, leaving us with just km]   km = 9.2x10^4/3.9x10^4 km   km = 2.36 = 2.4 km   Therefore, we can see that the closest answer is 2.4.
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The distance between a school and the closest grocery store is approximately 9.2 x 10^4 inches. Which of the following is closest to the distance between the school and the store, in kilometers? (1 kilometer is approximately 3.9 x 10^4 inches.)