Question 202777
The ratio of the weight on Mars to the weight on earth is {{{0.4/1 = 40}}}%.
So you would just multiply the object's earth-weight by 40% (or 0.4) to get the object's Mars-weight.
a) For the 12-ton rocket:
{{{12(0.4) = 4.8}}}tons.
b) For the astronaut:
{{{120(0.4) = 48}}}lbs.