On our last vacation, I bought 4 times as many tetras as Tim bought clowns. Tim bought twice as many clowns as Rick bought guppies. If Rick bought 30 guppies, how many animals did we buy on our last vacation?
If Rick bought 30 guppies, Tim bought 2 clowns/guppy * 30 guppies = 
<gadget id="calculator">2*30</gadget>
<output>60</output>
60 clowns.
The total number of tetras bought by you is 4 tetras/clown * 60 clowns = 
<gadget id="calculator">4*60</gadget>
<output>240</output>
240 tetras.
In total, the three bought 240 tetras + 60 clowns + 30 guppies = 
<gadget id="calculator">240+60+30</gadget>
<output>330</output>
330 animals.

<result>330</result>