If you weigh 100 pounds, and your 150 pound big sister is sitting 15 feet from the fulcrum of a seesaw, how far from the fulcrum on the other side would you have to sit to balance her exactly

22.5

Explanation:

My weight = 100 pounds

Sister's weight = 150

Distance from fulcrum = 15 ft

Distance has an inverse proportion with weight

Distance = k/w

Where k is a constant

K = distance x weight

K = 100 x distance

150 x 15 = 100 distance

2250 = 100 distance

Divide through by 100 to get distance

2250/100 = distance

Distance = 22.5

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