## Prealgebra (7th Edition)

$16 \text{ billion}\text{ km}\approx 9.942\text{ billion mi}$
If want to convert from kilometers to miles, we have to consider the following conversion rate: $1.6093\text{ km}\approx 1 \text{ mi}$ By dividing both sides by $1.6093$, we get: $1\text{ km}\approx \frac{1}{1.6093} \text{ mi}$ We multiply both sides by $16 \text{ billion}$ in order to get the answer to the question: $16 \text{ billion}\text{ km}\approx \frac{16 \text{ billion}}{1.6093} \text{ mi}=\frac{16}{1.6093} \text{ billion mi}\approx 9.942\text{ billion mi}$