TCS Company Logical Reasoning Blood Relations

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

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TCS Other Question

in what ratio must water be mixed with milk to gain 20% by selling the mixture at cost price The teacher is testing a student's proficiency and poses the following question:
1/3 of a number is 3 more than 1/6 of the same number.What is the number?
Can you help the student to find the answer?
1>18
2>21
3>6
4>12