Average temperature of first 4 days of a week is 38.6∘C and that of the last 4 days is 40.3∘C. If the average temperature of the week be 39.1∘C, the temperature on 4th day is.
A
36.7∘C
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B
38.6∘C
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C
39.8∘C
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D
41.9∘C
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E
None of these
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Solution
The correct option is D41.9∘C Let, temperature on the 4th day be x∘C ∴4×38.6+4∘40.3−x=7×39.1 or, x=41.9 ∴ Temperature on the 4th day =41.9∘C.