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5th Class Mathematics Decimals and Fractions Question Bank Fractions and Decimals

  • question_answer
    I think of a decimal number. After I have subtracted 2.9 from it, multiplied the result by 3 and then added 0.15. I get 10.5. What; decimal number I am thinking of?

    A)  4.5                              

    B)  15.66  

    C)         20.10              

    D)         None of these

    Correct Answer: D

    Solution :

    Let the number be X. According to question, we have \[\left( \text{X}-2.9 \right)\times 3+0.15\text{ = }10.5\] \[\Rightarrow \]\[3\times (X-2.9)=10.35\] \[\Rightarrow \]\[X-2.9=3.45\] \[\Rightarrow \]\[X=6.35\]


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