AVg marks of 25 student is 29.one student is left the group and rest student marks rose to 29.5.Then one new student come in as a result of which the avg marks of the group dropped to 28.5.what is the avg of combined mark of the student who left and who in?
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2
Answer:
14.75
Step-by-step explanation:
left = 25×29 - 24 × 29.5 = 17
in = 25×29 - 25 × 28.5 = 12.5
avg. of combined marks
= (17+12.5)/2 = 14.75
Answered by
0
Step-by-step explanation:
in is not 25*29 - 25* 28.5
it is 25* 28.5 - 24* 29.5 = 4.5
left = 25* 29 - 24*29.5 = 17
avg = (17+4.5)/2= 10.75
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