Out of four numbers, the average of first three is 16 and that of the last three is 15. If last number is 18, then first number is
Correct Answer: Description for Correct answer:
Sum of 2nd and 3rd number
\( \Large = \left(3 \times 15 - 18\right) = 27 \)
First number = \( \Large \left(3 \times 16 - 27\right) = 21 \)
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