6th Class Mathematics Ratio and Proportion Question Bank Ratio and Proportion

  • question_answer The ratio of weights of zinc and copper in an alloy is 5 :8. If the weight of copper in a sample of this alloy is 10.4 g, what is the weight of zinc?

    A) 6.5g                      

    B) 6g

    C) 7g                        

    D) 7.5g  

    Correct Answer: D

    Solution :

    Ratio of weights of zinc and copper = 5 : 8 Let the weights be \[5x\] and \[8x\]. Given \[8x\text{ }=\text{ }10.4\] \[\Rightarrow x=\frac{10.4}{8}=1.5\] \[\therefore \]Weight of zinc \[=\text{ }5x\text{ }=\text{ }5\text{ }\times \text{ }1.5\text{ }=\text{ }7.5g\]

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