On camels and dromedaries

Let $d$ be the number of dromedaries, and $c$ be the number of camels.
There are 60 animals in total, so $d+c=60$.
Because dromedaries each have one hump, and camels two, the total number of humps is $d+2c=95$.

This is a linear system with two unknowns, $c$ and $d$:
$$\left\{\begin{array}{l} d+c=60 \\ d+2 c=95 \end{array}\right.$$To solve it, we could subtract the first line from the second line, obtaining $c=35$. Plugging this back into the first line gives $d=60-c=60-35=25$.

Therefore, there are 25 dromedaries and 35 camels.