You can put this solution on YOUR website!
To solve this problem, we use the lever principle. A lever can be set up with unequal weights placed at different distances from the fulcrum (balancing point.) Here the lever is a teeterboard.
[I] Define the variables
is the weight of the larger boy = 80 lbs.
is the larger boy's distance from the fulcrum.
is the weight of the smaller boy = 50 lbs.
is the smaller boy's distance from the fulcrum = 4 ft.
In order for the teeterboard to be balanced, the following equation must be satisfied.
Substitute the values you know into the equation and solve for
In order to balance the teeterboard, the larger boy must sit 2.5 feet from the fulcrum.
That's it. Feel free to email me via gmail if the explanation is unclear.