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epic story title status
6 6.5 Proportions / Rule of Three draft

Epic 6 — Advanced Math & Functions

Goal: Scientific, financial, and power-user math.

Story 6.5: Proportions / Rule of Three

As a CalcPad user, I want to solve proportion problems using natural language, So that I can quickly compute unknown values in ratios without manually setting up equations.

Acceptance Criteria:

Given the user writes 3 is to 6 as what is to 10? When the engine evaluates Then the result is 5

Given the user writes 3 is to 6 as 5 is to what? When the engine evaluates Then the result is 10

Given the user writes 10 is to 5 as 20 is to what? When the engine evaluates Then the result is 10

Given the user writes 0 is to 5 as what is to 10? When the engine evaluates Then the result is 0

Given the user writes 3 is to 0 as 5 is to what? When the engine evaluates Then an error is displayed (division by zero in the proportion)