Question 389539
If the weights are directly proportional, the ratio (weight on earth):(weight on mars) will always be the same. So, using the data points we are given:

{{{118.75/47.5 = 98/W}}}
{{{2.5 = 98/W}}}
Multiply both sides by W to get it out of the denominator:
{{{2.5*W = (98/W)*W}}}

Cross out the Ws on the left because they are just multiplying by 1:
2.5*W = 98

Divide both sides by 2.5 to solve for W:
{{{(2.5*W)/2.5 = 98/2.5}}}
Cross out the 2.5/2.5 and do the division:
W = 39.2