Linear Equation Word Problems - Examples & Practice

A group of astronauts are headed to the International Space Station, ISS. The team of 3 astronauts in total will drink 6 liters of water every day they are in space. The Astronauts also will need 5 liters of water (in total) for their trip to the space station and 5 more for their return trip home. Let $w=$ liters of water and $d=$ days in space. Which linear equation models the liters of water should the crew bring up with them?