Solve the Maru 5 Heart Event Puzzle in Stardew Valley Expanded with Math!

Solve the Maru 5 Heart Event Puzzle in Stardew Valley Expanded with Math!

Maru's Five-Heart Math Event in SVE

Answers for Stardew Valley Expanded 1.15.11

Choose to help Maru, then answer 2 meters squared per minute and 0.24 atm. Completing the help path gives +50 friendship even if a quiz answer is wrong; refusing to help gives -50.

Trigger conditions

SVE event 1000011 is registered on the ScienceHouse map. It requires at least 1,250 friendship points with Maru, requires Maru to be present and visible, and requires that event 10 has not already been seen. Its key has no season, weather, or time condition, so enter the Carpenter's Shop while Maru is actually inside.

Math Problem 1

Maru asks for the rate of change of a circle’s area when its radius is 4 meters and its circumference increases at 0.5 meters per minute.

The rate of change of the area of the circle with a 4 meter radius
The player helping Maru solve the circle problem

Since C = 2πr, dr/dt = 0.5/(2π). With A = πr², dA/dt = 2πr·dr/dt = 2.

Answer: 2 square meters per minute.

Math Problem 2

The mixture contains 0.60 mol CO₂, 0.30 mol CO, and 0.10 mol H₂O at a total pressure of 0.80 atm.

The gaseous mixture of CO2, CO, and H2O
The player helping Maru determine the partial pressure of carbon monoxide

Total moles are 1.00. The CO mole fraction is 0.30, so Dalton’s law gives 0.30 × 0.80 = 0.24 atm.

Answer: 0.24 atm.

Friendship result

The friendship branch depends on whether you accept Maru’s request, not on whether both quiz answers are correct:

  • Complete the help path: +50 friendship.
  • Refuse to help: -50 friendship.
  • Correct answers use Maru’s positive response; wrong answers use a different dialogue response.
Maru and the player working on a math problem in the Carpenter's Shop
Maru and the player working together in the Carpenter’s Shop

For adjustable inputs and the full derivation, use the interactive Maru math solver.

Version: Stardew Valley 1.6.15.24356 / Stardew Valley Expanded 1.15.11.