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Question
A man spends 25 of his salary on food and 310 on house rent, electricity, etc. What fraction of his salary is still left with him?
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Solution
Step: Subtracting the fractional expenditure from 1
The fraction of his salary still left with hism can be calculated by subtracting the fractional expenditure from 1 because we denote the whole quantity by 1
Fraction of his salary left
= 1−25−310
= 1×10−2×2−310
[LCM of (5,10) = 10]
=10−4−310=10−710
=310
Hence, the fraction of salary left with the man is 310.
The fraction of his salary still left with hism can be calculated by subtracting the fractional expenditure from 1 because we denote the whole quantity by 1
Fraction of his salary left
= 1−25−310
= 1×10−2×2−310
[LCM of (5,10) = 10]
=10−4−310=10−710
=310
Hence, the fraction of salary left with the man is 310.
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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.