SSC CGL 24 Aug 2021 Shift 2 Paper

Ratio of first and second number
$=3:4$
Ratio of second and third number
$=5:6$
Now, ratio of first, second and third number $=$
$=3\times 5:5\times 4:4\times 6$
$=15\mathit{x}:20\mathit{x}:24\mathit{x}$
Difference between first and third number is $1125.$
$\Rightarrow 24\mathit{x}-15\mathit{x}=1125$
$\Rightarrow 9\mathit{x}=1125$
$\Rightarrow \mathit{x}=125$
So, second number $=20\times 125$
and third number $=24\times 125$
Average of second and third number
$=\frac{20\times 125+24\times 125}{2}$
$=\frac{125\times 44}{2}$
$=125\times 22=2750$