Force Calculated: Harris & Paul's Surfboard Challenge

[halo9909]

Homework Statement

Harris and Paul carry a surfboard that is 2.43 m long and weighs 155 N. Paul lifts one end with a force of 85 N.

What part of the board should Harris lift?
m from Paul

Homework Equations

T=Fd

The Attempt at a Solution

I just did 155N-85N
=70N
which is the amount Harris exerted,

After getting that force I am unsure of what to use to get the "d" he needed

 

[PhanthomJay]

You're missing the eqaution for rotational equilibrium, the sum of moments about any point = 0. Are you at all familiar with moments or torques, and the calculation of their directions and values?

 

[halo9909]

You're missing the eqaution for rotational equilibrium, the sum of moments about any point = 0. Are you at all familiar with moments or torques, and the calculation of their directions and values?

not sure exactly?
what would I have to do from here?