Question

(C)
Two groups of students, whose average ages are
15 years and 25 years, combine to form a third
group whose average age is 23 years. What is the
ratio of the number of students in the first group
to the number of students in the second group?
(a) 8:2
(b) 2:8
(c) 4:6
(d) None of these
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Answer 1

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