On camels and dromedaries

A herd of dromedaries and camels is walking in the desert. There are 60 animals and 95 humps. How many camels are there? And how many dromedaries?

P.S.: We assume here that they could be in the same herd even though it is highly impossible, as they don’t live on the same continent!

Reminder: dromedaries have one hump and camels two.
camel and dromedary

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Solution by Ancient Tree

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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.

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