a boy spends 3/4 of his pocket money and then 4/5 of the remainder is given to his sister. if he has Rs.40 left, what did he have at first
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total expenditure =3/4+4/5=31/20
saving=40
income=40+31/20= rs 41 11/20
saving=40
income=40+31/20= rs 41 11/20
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