In a class of 20 students the average age is 15. A new student replaces an old student, the difference between their ages is unknown. The new average is reduced by 3 years, the the age of new student is?
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Answer:
the difference between their ages = 60 years
Step-by-step explanation:
In a class of 20 students the average age is 15. A new student replaces an old student, the difference between their ages is unknown. The new average is reduced by 3 years, the the age of new student is?
20 students in class
Average age = 15
Total Age = 20 * 15 = 300
New Average = 15 - 3 = 12
Number of students = 20
New Total Age = 12 * 20 = 240 Years
Total Age reduced by 60 Years
Age of new students is 60 Years less than the student replaced
the difference between their ages = 60 years
Answered by
1
Answer:
As we are not aware of the age of existing student it is not possible to determine the actual age of new student. Only the difference between their ages can be determined.
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