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    Question

    A student has two types of markers: Marker A priced at

    $3 each and Marker B priced at $5 each. If the student purchases a total of 12 markers, with an average cost of $4 per marker, how many of each type did the student buy?
    A 4 of A and 8 of B Correct Answer Incorrect Answer
    B 6 of A and 6 of B Correct Answer Incorrect Answer
    C 3 of A and 9 of B Correct Answer Incorrect Answer
    D 7 of A and 5 of B Correct Answer Incorrect Answer
    E 8 of A and 4 of B Correct Answer Incorrect Answer

    Solution

    Let x be the number of Marker A and 12−x be the number of Marker B. By alligation method- Ratio of marker A to marker B = (5-4): (4-3) = 1: 1 Which means the student buys 6 markers of A, and 6 markers of B.

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