Math Problem Statement
Kameren has blue and black pens. He has 40 pens in total, and 35% of them are blue. How many black pens does he have?
Solution
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Math Problem Analysis
Mathematical Concepts
Percentage
Subtraction
Basic Arithmetic
Formulas
Number of blue pens = Total pens × Percentage of blue pens
Number of black pens = Total pens - Number of blue pens
Theorems
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Suitable Grade Level
Grades 4-6