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Question

The average temperature of the first three days of a week is 27$$^o$$C and the next three days is 29$$^o$$C. If the weekly average is 28.5$$^o$$C. What is the temperature on the last day?


A
31.5oC
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B
28oC
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C
21oC
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D
42oC
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Solution

The correct option is A 31.5$$^o$$C
Mean temperature would be given by:
$$ \dfrac{27 \times 3 +29 \times 3+ {Temperature of Last Day} }{7}= 28.5$$

$$\therefore 28.5 \times 7 - 27 \times 3 - 29 \times 3 = 31.5^o C$$

Mathematics

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