Question

5 m long see-saw remains horizontal when two children weighing 20 kg and 30 kg respectively sit at two ends. Where is the see-saw supported?

Options

• 3 m from 20 kg

• 2.5 m from 30 kg

• 4 m from 20 kg

• 3.5 m from 30 kg

Answer 1

3 m from 20 kg

Explanation:

`20 xx "x" = 30 (5 - "x")`

`20  "x" = 150 - 30  "x"`

`therefore 50  "x" = 150`

`therefore "x" = 3  "m from"  20  "kg"`