How many earths can fit inside mars?

Question: How many earths can fit inside mars?
- Keywords:
  earth,
  Mars,
  planet
Asked by anon-219147 to Emma on 20 Jun 2019.
- Emma Davies answered on 20 Jun 2019:
  
  Mars is actually smaller than the Earth! The radius of Mars is 3,389.5 km, which is just over half that of the Earth’s: 6,371 km. If you assume they’re both perfect spheres, this means that you can actually fit about 7 Mars’s inside Earth!

Question: How many earths can fit inside mars?