If we have 48 legs and 20 humps in our herd of camels and dromedaries,

**How many dromedaries are in the group?**

#### Solution

If we divide the number of legs by 4 we get the total number of animals that are 12.

Now we distribute a hump for each animal and we see that there are 8 left over that correspond to the camels that have 2 humps each. Therefore we have 12 - 8 = **4 dromedaries**.