A dog runs through a field and is joined by a group of 4 cats. 2 rabbits join each cat and 3 hares join each rabbit. How many animals are running through the field?
A pair of rabbits join each cat so there must be 4 cats * 2 rabbits/cat = 
<gadget id="calculator">4*2</gadget>
<output>8</output>
8 rabbits.
As 3 hares join each rabbit, there must be 8 rabbits * 3 hares/rabbit = 
<gadget id="calculator">8*3</gadget>
<output>24</output>
24 hares.
Counting all the animals shows there are 1 dog + 4 cats + 8 rabbits + 24 hares = 
<gadget id="calculator">1+4+8+24</gadget>
<output>37</output>
37 animals running through the field.

<result>37</result>