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Side of a square is first increased by 10% and then decreased by 20%.What is the overall percentage change in area?

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father present age is 3 times of the sum of present age of his two sons .after 20 years father's age will be equal to the sum of his son's ages .find the age of father

The ratio of ages of the father and mother was 11:10 when their son was born . the ratio of ages of the father and mother will be 19:18 when the son will be twice his present age . what is the ratio pf present ages of father and mother?

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