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    Question

    Out of 4 numbers, the average of first 3 is 19 and last

    3 is 20. If the last number is 21. Find the first number?
    A 18 Correct Answer Incorrect Answer
    B 9 Correct Answer Incorrect Answer
    C 13 Correct Answer Incorrect Answer
    D 16 Correct Answer Incorrect Answer

    Solution

    Sum of first three numbers = 19 ├Ч 3 = 57 Given that last number is = 21 тИ┤ sum of all the four numbers = 57 + 21 = 78┬а..(i) Sum of last 3 digits = 20 ├Ч 3 = 60..(ii) By subtracting (ii) from (i), we will get the first number, the first number, First number = (i) тАУ (ii) = 78 тАУ 60 = 18

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