A boy spend 3/4 of is pocket money and then 4/5 of his remainder is given to his sister.If he has Rs. 40 left, What did he have at first.

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let the total money be=x

theboy spend money=3/4*x=3x/4

remainder=x-3x/4=x/4

money given to the sister=x/4*4/5=x/5

the total money=x-(3x/4+x/5)=40

=x-(19/20)=40

x-800/19

x/1-800/19x

19x-800/19x=800ans

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