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4.Average
medium
Out of four numbers, whose average is $60,$ the first one is one-fourth of the sum of the last three. The first number is
A
$15$
B
$45$
C
$48$
D
$60$
Solution
Let, the number be $x$, then
$x=\frac{240-x}{4}$
$\Rightarrow 4 x=240-x$
$\Rightarrow 4 x+x=240$
$\Rightarrow \quad 2 x=240$
$\Rightarrow x=\frac{240}{5}=48$
Standard 13
Quantitative Aptitude