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Question

The average temperature of the first three days of a week is $$\displaystyle 27^{\circ}C$$ and the next three days is $$\displaystyle 29^{\circ}C$$. If the weekly average is $$\displaystyle 28.5^{\circ}C$$, What is the temperature on the last day?


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

The correct option is B $$\displaystyle 31.5^{\circ}C$$
$$\displaystyle 28.5\times 7-27\times 3-29\times 3=31.5^{\circ}C$$

Mathematics

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