Answer:
one way to solve this question is to realize that every 100 pounds on planet A equals only 3 pounds on planet B.
So, 5000 pounds divided by 100 = 50. Then that number times 3 will give the weigh on planet B which is 150 pounds.
Algebraically, 100/3 = 5000/x; when we cross multiply, we get 15000/3 = x; x = 150