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4.Average
medium
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 $4^{th}$ day is. (in $^{\circ} C$)
A
$36.7$
B
$38.6$
C
$39.8$
D
$41.9$
Solution
Let, temperature on the $4^{th}$ day be $x^{\circ} C$
$\therefore 4 \times 38.6+4 \times 40.3-x=7 \times 39.1$
or, $x=41.9$
$\therefore \quad$ Temperature on the $4^{th}$ day $=41.9^{\circ} C$.
Standard 13
Quantitative Aptitude
