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4.Average
medium
The average annual income (in $Rs.$) of certain agricultural workers is $S$ and that of other workers is $T$. The number of agricultural workers is $11$ times that of other workers. Then the average annual income (in $Rs.$) of all the workers is
A
$\frac{S+T}{2}$
B
$\frac{S+11T}{2}$
C
$\frac{1+T}{11S}$
D
$\frac{11S+T}{12}$
Solution
Average annual income of agricultural worker $=S$
Average annual income of other workers $=T$
Let other workers be $n$ in number and agricultural works be $11 n$ in number.
$\frac{11 n \times S+n \times T}{12 n}=\frac{11 S+T}{12}$
Standard 13
Quantitative Aptitude
