Pulleys/Static equilibrium

[xdevinx]

Homework Statement

Find the mass m of the counterweight needed to balance the 1600 kg truck on the incline. Assume all pulleys are frictionless and massless.

Picture attached

Homework Equations

Conditions for static equilibrium so that angular acceleration=0:
$$\sum$$Torque=0

The Attempt at a Solution

We're learning about rotational dynamics and torque and I honestly cannot make the connection between that and this problem. Please help ):

 

[tiny-tim]

Welcome to PF!

Find the mass m of the counterweight needed to balance the 1600 kg truck on the incline. Assume all pulleys are frictionless and massless.
…
We're learning about rotational dynamics and torque and I honestly cannot make the connection between that and this problem. Please help ):

Hi xdevinx! Welcome to PF!

I can't see the diagram yet, but if this is a standard weight-pulley-weight problem, then rotational dynamics and torque and irrelevant …

just call the tension T, and use good ol' Newtons second law twice (once on each weight).