Bobby has an aquarium with twice as many fish as Sarah's has.  Sarah has 5 more fish in her aquarium than Tony does.  Tony has 3 times as many fish in his aquarium as Billy does.  Billy has 10 fish.  How many fish do all 4 people have put together?
Since Tony has 3 times as many fish as Billy's 10, that means Tony has 3*10= 
<gadget id="calculator">3*10</gadget>
<output>30</output>
30 fish.
Sarah has 5 more fish than Tony's 30, meaning she has 5+30= 
<gadget id="calculator">5+30</gadget>
<output>35</output>
35 fish.
Bobby has twice as many fish as Sarah does, meaning he has 35*2=
<gadget id="calculator">35*2</gadget>
<output>70</output>
70 fish.
Therefore, altogether there are 10+30+35+70=
<gadget id="calculator">10+30+35+70</gadget>
<output>145</output>
145 fish.

<result>145</result>