New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    A girl found the answer for the question “subtract the

    sum 1/4 and 1/8 from unity and express the answer in decimals” as 1.5. The percentage of error in her answer was?
    A 300% Correct Answer Incorrect Answer
    B 266.66% Correct Answer Incorrect Answer
    C 140% Correct Answer Incorrect Answer
    D 400% Correct Answer Incorrect Answer
    E 180% Correct Answer Incorrect Answer

    Solution

    Correct answer = 1 - (1/4+1/8) = 1 - ((2+1)/8)   ⇒ 1  - 3/8 = 5/8  = 0.625 Difference in answer = 1.5 - 0.625 = 0.875 Required percentage = 0.875/0.625 × 100 = 140 %

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