On Tue, 23 Oct 2007 16:54:03 -0400, "HDRDTD"
wrote:

This one triped up every engineer here that has taken the test so far.

I was thinking along the same lines at first, noting that if you measure
from the center of each box to the fulcrum, the the distance ratio appears
to be 5:1 but that results in an answer of 60kg, and that ain't an option
given.

However....

If you look at it as each box sites on two segments, and count that way, or
in other words if each segment was shown as the width of a box, the the
ratio appears as 3:1 which provides the correct solution.



I found this question doesn't have a correct answer. This is a simple
"moment arm" calculation. The center of gravity of the weight to the
fulcrum. In real life, the board itself must be considered, and it,
too, has a moment arm. "60kg" is correct but not a choice.