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a father tom`s age is three times the sum of the ages of his two children,but 20yrs hence his age will be equal to the sum of their ages.then the father tom age is?

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the sum of ages of leo and his son jan is 45yrs . five yrs ago the product of their ages was four times leo age at that time.the present age of leo is? coffee worth rs.126/kg are mixed with a third variety in the ratio 1:1:2. if the mixture is worth rs.153/kg then the price of the third variety per kg will be?