Multiple choice

The average of five numbers is 612. If the average of the first two numbers is 418 and the average of the last two numbers is 521, find the third number.

  1. 1172

  2. 1182

  3. 1185

  4. 1180
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B Correct answer
Explanation

Sum of 5 numbers = 5 × 612 = 3060. Sum of first 2 = 2 × 418 = 836. Sum of last 2 = 2 × 521 = 1042. Third number = 3060 - 836 - 1042 = 1182.

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