The answer seems to be E. Are you sure it's D ?
Let x be mean of weights and n be the number of people.
=> x*n - Total Weight
From (1) we have :
x + 20 is new mean
(x + 20) (n + 3) - New total weight[(x+20) (n + 3) - xn]/3
is average weight of 3 people
From (2) we have :
x*n - 205 + 3*w = 20*n
Even (1) and (2) are not enough, so E.
Could someone please opine on whether I'm correct ?
Formula of Life -> Achievement/Potential = k * Happiness (where k is a constant)