Re: [tancet] TANCET Math : Averages
From: "Ascent Education CAT, Classes, Groups" <cat@...>
Sent: Fri, February 19, 2010 1:58:38 PM
Subject: [tancet] TANCET Math : Averages
This question is from the topic Averages.
5 years back the average age of A and B was 15 years. At present the average age of A, B and C is 20 years. How old is C?
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Ans for the question is no. 1 option i.e. 20
The simplification is as follows:
The avg age of A and B before 5 years is 15. i.e. (A+B)/2 = 15.
Therefore, the present avrg age will be:
Simplifying this eqn, weget
=> (A+B)= 40 ----(i)
The present average age of A,B and C is 20 i.e (A+B+C)/3= 20
Sub. eqn (i) in above eqn: weget,
=> Thrfre, C= 60-40, i.e. 20years