Question

Bruce weighs 30kg (FE) and sits 6ft (LE) from the fulcrum of a see-saw. If
Clark weighs 40kg (FR) and sits on the other side, how many feet from
fulcrum must he sit to have the see-saw balanced? (Calculate LR).

Answer 1

Answer:

Explanation:

: Assign variables:

Let x = distance of John from the fulcrum

Let 10 - x = distance of Jane from the fulcrum

Step 2: Sketch the diagram

lever diagram ex 1

Step 3: Obtain equation from the diagram

90(x) = 60(10 – x)

Use the Distributive Property

90x = 600 – 60x

Isolate variable x

90x + 60x = 600

150x = 600

x = 4