1. Convert the weights from pounds to newtons (This conversion is the same anywhere):
25 lbs (1.0 N/.225 lb) = 111 N

(I don't know about the precision of the 25 lbs.)

Similarly, 9.4 lbs = 41.8 N

2. Find the mass by using earth data:

m = W/g = 111 N / 9.8 N/kg = 11.3 kg

3. Use this mass & the weight on Mars to find g on Mars:

g = W/m = 41.8 N / 11.3 kg
= 3.7 N/kg or 3.7 m/s2

You'll read later about the landing of the Pathfinder craft that carried Sojourner. What effect do you think this relatively small value of g would have on this landing?