8th Class Mathematics Percentage Question Bank Percentage, Profit and Loss

  • question_answer A litre of water was evaporated from 8L of salt solution containing 8% salt. The percentage of salt left in the remaining solution is

    A)  \[7\frac{1}{7}%\]                                 

    B)  \[7\frac{1}{9}%\]          

    C)  \[9\frac{1}{7}%\]

    D)  \[7\frac{1}{3}%\]

    Correct Answer: C

    Solution :

    (c): % age means \[\frac{\text{weight}}{\text{volume}}%\text{ }age\Rightarrow \] in 100 ml, Salt being non-volatile, will not evaporate In 81, we have \[8000ml\Rightarrow \frac{8}{100}\times 8000\]gm salt = 640 gm salt. After evaporation 7L solution is left with same 640 gm salt \[=\frac{W}{V}%=\frac{640\,gm}{7000\,mL}\times 100%=9\frac{1}{7}%\].        

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