lean_workbook_plus_2300

Proved

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

If $x$ is $20\%$ of $23$ and $y$ is $23\%$ of $20$ , compute $xy$ .

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_2300 (x y : ℝ) (hx : x = 20 / 100 * 23) (hy : y = 23 / 100 * 20) : x * y = 21.16   :=  by sorry

Source