Aptitude - Problems on Ages - Discussion

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"Hold a true friend with both hands."

- (Proverb)

A is two years older than B who is twice as old as C. If the total of the ages of A, B and C be 27, the how old is B?

Answer: Option A

Explanation:

Let C's age be x years. Then, B's age = 2x years. A's age = (2x + 2) years.

(2x + 2) + 2x + x = 27

5x = 25

x = 5.

Hence, B's age = 2x = 10 years.

Dharumaraj S said: (Mon, Jun 7, 2010 12:50:30 PM)

(b-2)+ b + .5b =27 which is an alternate method to solve the same problem.....

Suresh said: (Wed, Jun 16, 2010 05:00:30 AM)

Mr Dharumaraj shall you please explain ur answer?

Shan said: (Sat, Aug 21, 2010 01:37:45 AM)

Hi, let c year is x then B is twice of C then, B=2x Then A is 2 years older then B, therefore now B=2x,Then A=2+B, that is A=2+2x Therefore sum up all the value:[(2+2x)for A,2x for B,x for C] therefore 2+2x+2x+x=27 5x+2=27 5x=27-2 5x=25 x=25/5 x=5 now B is directly linked with C rather then A Therefore B=2x where x=5 2*5=10 that'z it my frnd

Sri said: (Sat, Oct 2, 2010 12:36:02 PM)

B is twice as old as C means C=2B right?

Sweta said: (Wed, Dec 22, 2010 06:27:52 AM)

We can also solve as A's age be x yrs. then B's age is x-2 and C's age is(x-2)/2.

Prashanth said: (Wed, Jan 19, 2011 03:50:40 AM)

Your thought is right but answer will be wrong..just watch A+B+C=27 x+x-2+(x-2)/2 = 27 2x+2x-4+x-2 = 27*2= 54 5x-6 = 54 5x= 48 Finally x=48/5 which is a wrong ans always we have to equal the x to the smallest number as per the problem....

Shalini said: (Tue, Feb 22, 2011 12:28:10 PM)

I got ur explantion but in solving y cannt we take 2(2x)+2x+x=27 bcoz when i read this question i did in this way only but when after I saw this answer it was different. SO PLZ TELL ME SOME TIPS HOW 2 IDENTIFY THIS IS BELONGS 2 THIS METHODS

Ilaks said: (Tue, May 17, 2011 09:48:07 AM)

@shalini Read the ques properly. Assume C=X. it is given that A IS 2 YEARS OLDER THAN B. It means that we should ADD the 2 years to B's age, so A=B+2. Then for C it is given that it was TWICE AS OLD AS C. so it is understood tat it should be MULTIPLIED WITH THE C'S AGE. so B=2X. Finally, sub B=2X in A's equation(A=B+2). therefore A=2X+2 Now A+B+C=27, therefore sub the values of A,B,C in the equation 2X+2+2X+X=27 5X+2=27 5X=27-2 5X=25 X=5.

Vignesh Venkatesan said: (Wed, May 18, 2011 07:36:11 AM)

@Sri b is twice old as c means.. c=b/2 b=2c

Wisdom said: (Mon, Jul 4, 2011 07:05:03 AM)

a=x; b=x-2; c=(x-2)/2; a+b+c=27 x+x-2+[(x-2)/2]=27 [2x+2x-4+x-2]/2=27 5x-6=54 5x=60 x=12 b=x-2; b=10 we got answer

Sathya said: (Mon, Aug 8, 2011 12:09:29 PM)

Why we take c=x. Why we not take that a=x;. Please explain.

Swetha said: (Tue, Aug 9, 2011 05:38:21 PM)

@Sathya We can take a = x also. Whatever we take, answer 'll be same.

Jatinder S said: (Sun, Sep 11, 2011 11:11:42 AM)

A=B+2....1 given B=2C .......2 given from statement 2 : C=B/2 total is 27 therefor A+B+C=27 B+2+B+B/2=27 4B=50 B=10.

Srini said: (Fri, Nov 4, 2011 11:36:31 AM)

Can you give me short cut to solve this?

Nagendra said: (Thu, Dec 22, 2011 10:01:46 AM)

The population of town was 24000. If males increases by 6% and females by9%, it becomes 25620. Number of males and females are?- Please any one explain me...