TCS Company Numerical Ability Profit and Loss

in what ratio must water be mixed with milk to gain 20% by selling the mixture at cost price

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TCS Other Question

Ques 35).The bacteria has the probability of split into 3 and probability to die is 1/3rd of the total bacteria.Let the
probability is P.Some of them survived with probability 1/5.Then which among the following relation is true?
a)P=1/3+1/5*3 b)P=1/5*(1/8-3)
A man is standing in front of painting of a man,and he tells us the following:
"Brothers and Sisters have i none,but this man's father is my father's son".Who is on the painting...
1.His father
2.His grandfather
3.His son
4.He himself