Elitmus Exam Numerical Ability Data Sufficiency

If the age of father is 4 years greater than the mother and 28 years greater than the son,then what is the age of the father:
which one should be used to calculate the age?
i)mother/son=non-prime no
ii)mother/son=perfect square

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Elitmus Other Question

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= disuse
there are three players playing an chess competetion at a time only 2 players can play the chess game and player A wins 15 games player B wins 14 games and player c wins 9 games ..
so who played the 11 th match and how many games did player C lost .