Come up with calculations with topic of temperature and thermal equilibrium

Here's a calculation problem involving temperature and thermal equilibrium:

A $200 \text{ g}$ copper block at $100^\circ\text{C}$ is placed into $300 \text{ g}$ of water at $20^\circ\text{C}$ in an insulated container. Calculate the final equilibrium temperature of the system.

Given:

• Specific heat capacity of copper ($c_{Cu}$) = $385 \text{ J/(kg}\cdot^\circ\text{C)}$
• Specific heat capacity of water ($c_w$) = $4186 \text{ J/(kg}\cdot^\circ\text{C)}$