The average age of 10 students is 15 years.
When 5 more students joined the group the
average age rose by 1 year. The average age in
years of the new student is
(b) 18 years
(d) None of these
(a) 15 years
(C) 21 years
Answers
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Answer:
18 years is the answer
Explanation:
no explanation as it can be done only with pen and papers
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