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8th Class Mathematics Comparing Quantities Question Bank Commercial Mathematics

  • question_answer
    In an examination there were 640 boys and 360 girls. 60% of the boys and 80% of the girls were successful. The percentage of failure was

    A) 20                   

    B)          60

    C) 30.5                

    D)          32.8

    Correct Answer: D

    Solution :

    number of failures = 40% of 640 + 20% of 360 \[=\frac{40}{100}\times 640+\frac{20}{100}\ \times 360\] = 256 + 72 = 328 \[\therefore \]    % of failures \[=\left( \frac{328}{640+360} \right)\,\times 100\]             \[=\frac{328}{1000}\times 100=32.8%\]


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