TCS Company Logical Reasoning Blood Relations

A man is standing before a painting of a man and he says I have no bro and sis and his father is my father’s son?

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TCS Other Question

A student's average ( arithmetic mean) test score on 4 tests is 78. What must be the students score on a 5th test for the students average score on the 5th test to be 80? . If one lady have 3 daughter and any of out 3 have diff, of ages is 3.And oldest is 3 times of more than 2 than yougest after 2 years then tell the age of oldest daughter.