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**1. Homework Statement**

A ferry boat is 4.0 m wide and 6.0 m long. When a truck pulls onto it, the boat sinks 4.00 cm in the water. What is the combined weight of the truck and ferry?

**2. Homework Equations**

Buoyant force = Weight of the floating object

**3. The Attempt at a Solution**

How would I find the weight when I don't know the mass of either object? I don't know what equation I would use or how to get started on the problem...