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 4 th day is-A- 36-7- CB- 38-6- CC- 39-8- CD- 41-9- CE- None of these

The correct option is D 41.9^∘ CLet, 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. ...

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Byju's Answer

Standard VII

Biology

Measuring Temperature

Average tempe...

Question

Average temperature of first 4 days of a week is ${38.6}^{\circ} C$ and that of the last 4 days is ${40.3}^{\circ} C$ . If the average temperature of the week be ${39.1}^{\circ} C$ , the temperature on 4th day is.

{36.7}^{\circ} C

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{38.6}^{\circ} C

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{39.8}^{\circ} C

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{41.9}^{\circ} C

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None of these

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Solution

The correct option is D ${41.9}^{\circ} C$
Let, temperature on the 4th day be $x^{\circ} C$
$∴ 4 \times 38.6 + 4^{\circ} 40.3 - x = 7 \times 39.1$
or, $x = 41.9$
$∴$ Temperature on the 4th day $= {41.9}^{\circ} C$ .

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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.

The correct option is D 41.9∘CLet, 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.

Average temperature of first 4 days of a week is ${38.6}^{\circ} C$ and that of the last 4 days is ${40.3}^{\circ} C$ . If the average temperature of the week be ${39.1}^{\circ} C$ , the temperature on 4th day is.

The correct option is D ${41.9}^{\circ} C$
Let, temperature on the 4th day be $x^{\circ} C$
$∴ 4 \times 38.6 + 4^{\circ} 40.3 - x = 7 \times 39.1$
or, $x = 41.9$
$∴$ Temperature on the 4th day $= {41.9}^{\circ} C$ .