A man spends of his salary on food and of the remaining on house rent,
electricity, etc. What fraction of his salary is still left with him?
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his house rent and electricity =3/10(x-2/5x) = 3/10(3/5x) =9/50x. The fraction of salary left with him = x-2/5x-9/50x =50x-20x-9x/50 = 0.42x So 42% of the salary is left still with him
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