$Q$ is as much younger than $R$ as he is older than T. If the sum of the ages of $R$ and $T$ is $50$ years, what is definitely the difference between $R$ and $Q$'s age?

1. The difference of age b/w $R$ and $Q=$ The difference of age b/w $Q$ and $T$.

2. Sum of age of $R$ and $T$ is $50$ i.e. $\left(R+T\right)=50$.