7th Class Mathematics Fractions and Decimals Question Bank Fractions and Decimals

  • question_answer 39) By which number should the decimal 8.9 be multiplied with so that the product is 31.15?

    A)  2.3                              

    B)  1.3           

    C)  3.5      

    D)  2.5

    Correct Answer: C

    Solution :

    (c) Let number be\[x\] Then \[8.9\times x=31.15\,\,\therefore x\] \[=\frac{31.156}{8.9}=\frac{\overset{\,\,\,\,\,\,\,\,\,\,35}{\mathop{\bcancel{3115}}}\,}{\underset{\,\,\,\,\,\,10}{\mathop{\bcancel{890}}}\,}=\frac{35}{10}=3.5\]                              

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