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
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