Question

About how many times farther from the sun is Pluto than Mercury?

Answer 1

Mean distances from Sun of Earth, Mercury and Pluto are 1 AU, 0.38 AU and 39.48 AU. So, Pluto is 39.48/0.38 = 103.9 times as far as Mercury from Sun. .

Explanation:

For minimax limits, the perihelion and aphelion distances have to be used.