Answers

2014-10-05T19:37:32+05:30
Let age of ani =a, biju=b, cathy =c, dharam =d.
there are 2 cases, lets say Ani is elder than Biju  , case 2 would be Biju is elder than Ani,
Try that too, but lets take in case 1.                    
a-b = 3
d=2a
b=2c
d-c=30
substituting
(2a -b/2)2=30*2
a-b=3
now
    4a - b = 60
  -  a   - b = 3
     3a = 57
a= 19, as biju is smaller than ani, b=16, d=2a, so d=38, c=b/2 so c=8years.
You could take ani as smaller than biju, but u would get it wrong and dharam is father of ani , so will be bigger than biju and cathy.
now d-c = 30, as 38-8= 30
so you may get it wrong on  first attempt , but see to it that u try both cases.

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