Math Problem Statement

Solution

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Math Problem Analysis

Mathematical Concepts

Algebra
Number Theory
Digit Manipulation

Formulas

x + y = 9
9 * (10x + y) = 90x + 9y
Reversed number: 10y + x
Twice the original number: 2 * (10x + y)

Theorems

Equation solving using substitution
Digit place manipulation

Suitable Grade Level

Grades 9-10