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Question

Average temperature of first 4 days of a week is 38.6C and that of the last 4 days is 40.3C. If the average temperature of the week be 39.1C, the temperature on 4th day is.
  1. 36.7C
  2. 38.6C
  3. 39.8C
  4. 41.9C
  5. None of these


Solution

The correct option is D 41.9C
Let, temperature on the 4th day be xC
 4×38.6+440.3x=7×39.1
or, x=41.9
Temperature on the 4th day =41.9C.

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