Question:
Find the value of $a_2+a_4+a_6+a_8+\dots+a_{98}$ if $a_1, a_2, a_3, \ldots$ is an arithmetic progression with common difference $1$ and \[a_1+a_2+a_3+\dots+a_{98}=137.\]

Answer:
Let $S = a_1 + a_3 + \dots + a_{97}$ and $T = a_2 + a_4 + \dots + a_{98}$. Then the given equation states that $S + T = 137$, and we want to find $T$.

We can build another equation relating $S$ and $T$: note that \[\begin{aligned} T-S &= (a_2-a_1) + (a_4-a_3) + \dots + (a_{98}-a_{97}) \\ &= \underbrace{1 + 1 + \dots + 1}_{49 \text{ times }} \\ &= 49 \end{aligned}\]since $(a_n)$ has common difference $1$. Then, adding the two equations $S+T=137$ and $T-S=49$, we get $2T=137+49=186$, so $T = \tfrac{186}{2} = \boxed{93}$.