Let their ages be x, y, z
Hence given that x + y + z = 65
Now, six years ago x age is x - 6, y is y - 6 and that of z is z - 6
Then the sum of their ages six years ago is (x + y + z) - (6 + 6 + 6) = 65 - 18 = 47
Given S = 17 yrs
A = 16 yrs
B = 12 yrs
Average = 17 + 16 + 12/3 = 15 yrs
Given if Aslam added to them, their average increases by 5
=> Average of 4 members = 20
Let the age of Aslam be 'x'
Then,
17 + 16 + 12 + x /4 = 20
=> x = 80 - 45
=> x = 35.
Hence, the age of Aslam is 35 yrs.
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