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Question
A man spends 2/5 of his salary on food and 3/10 on house rent what fraction of his salary is still left with him?
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Solution
Dear student
Let the total salary be 10/10=1
Salary left=1-{(2/5)+(3/10)}
=1-(7/10)
=3/10
Regards
Let the total salary be 10/10=1
Salary left=1-{(2/5)+(3/10)}
=1-(7/10)
=3/10
Regards
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of his salary on food, 
on house rent and 
on miscellaneous items, then find the fraction of his salary that remains with him.