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(Guest)

Originally posted by : Manjul Soni.
	Originally posted by : !..SaNKeT..! See total Age of 10 Students = 10 Students * 20 Years = 200 New Average = 20 Years + 2 Years = 22 Years Total Age of 12 Students = 12(10+2) Students * 22 Years = 264 Total age of the 2 new students = 264 - 200 = 64 Avg age of the new students = 64 / 2 = 32 years

K.K.K. (Professional) (131 Points)
Replied 18 March 2012

Originally posted by : swati ghosh
	if x is inversely related with square of y for x =1 & y=2 then find the value of x when y=6 : a).3 b).9 c).1/3 d).1/9

x=k * 1/y2 (where k is a constant)

(note: constant is used because the question uses term "related" and the word "equal")

put x=1 & y=2, it will give the value of k as 4.

Let y=6, & k being constant so having value as 4 as above, then putting these vaues:

x=4* 1/6squire

x=4*1/36

x=1/9 (it is the answer)

vikash (Chartered Accountant) (279 Points)
Replied 20 March 2012

C is the correct answer

vikash (Chartered Accountant) (279 Points)
Replied 20 March 2012

The Total Age of 10 Students are 10 Students * 20 Years = 200

New Average becomes 20 Years + 2 Years = 22 Years

Total Age of 12 Students = 12(10+2) Students * 22 Years = 264

Total age of the 2 new students = 264 - 200 = 64

Average age of the new students = 64 / 2 = 32 years.