Math Problem Statement
Först ökar ett tal med 15%. Det nya talet minskar sedan med 25%. Då får du talet 138. Vad var talet från början?
Solution
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Math Problem Analysis
Mathematical Concepts
Percentage Increase
Percentage Decrease
Algebra
Formulas
New value after increase: x + 0.15x = 1.15x
New value after decrease: 1.15x - 0.25(1.15x) = 0.75(1.15x) = 0.8625x
Equation: 0.8625x = 138
Theorems
Basic Percent Change Theorem
Suitable Grade Level
Grades 8-10
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