Haryana Police Constable Model Paper 8

Ram : Mohan = 4 ∶ 5
Mohan : Anil = 5 ∶ 6
Ram : Mohan : Anil = 4 ∶ 5 ∶ 6
Let the present ages of Ram, Mohan and Anil be $4\mathrm{x}$ , $5\mathrm{x}$ and $6\mathrm{x}$ respectively, where $\mathrm{x}$ is any constant, then,
If sum of their ages be 90 years
$4\mathrm{x}+5\mathrm{x}+6\mathrm{x}=90$
$\Rightarrow 15\mathrm{x}=90$
$\Rightarrow \mathrm{x}=6$
∴ Present age of Mohan $=5\mathrm{x}=5\times 6=30$ years.
Hence, the present age of Mohan is 30 years.