general Maths Puzzle

Father distributed certain money among his 5 sons such that first gets the one fifth of the total, second gets one fourth of the remaining,the third gets one third of the remaining and fourth gets the half of the remaining and fifth gets the remaining Rs 240 in succession.How much total money father distributed among his sons ?

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general Other Question

If (x/y)+(y/x)=-1, then x^3-y^3= ? If the sum of the ages of a father and his two sons two years ago was 50. After eight years the sum of their age will be 80.If the age of elder son is 2 years more than younger son.What is the present age of elder son ?