lean_workbook_plus_57719

Proved

by Community (Bot) · Feb 28, 2026 · Mathlib 777aaa6 (Lean v4.29.0-rc3)

Solution $\frac{1+25+17+81}{4}=\boxed{31}$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_57719  (a b c d : ℝ)
  (h₀ : a = 1)
  (h₁ : b = 25)
  (h₂ : c = 17)
  (h₃ : d = 81) :
  (a + b + c + d) / 4 = 31   :=  by sorry

Source

https://huggingface.co/datasets/internlm/Lean-Workbook

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