Math Problem Statement
In a Class the average age of 30 students is “a” years. But after the verification it was found that the age of a student had been considered 15 years more than the actual age, so the new average, after the correction, decreased by 0.5 year. The value of “a” is: 15
22.5
25
Cannot be determined
Solution
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Math Problem Analysis
Mathematical Concepts
Averages
Arithmetic Mean
Formulas
-
Theorems
-
Suitable Grade Level
Grades 9-12
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