A blind cave scorpion survives by catching millipedes. It needs to eat lots of millipedes to survive: a total of 800 body segments every day. If it's already eaten one millipede with 60 segments and 2 millipedes that are twice as long, how many 50-segment millipedes does it need to eat to reach its daily total?
First, the number of segments in the 2 millipedes that are twice as long is 60 segments * 2 = 
<gadget id="calculator">60*2</gadget>
<output>120</output>
120 segments.
Then one can multiply the segments by the 2 millipedes to find the total number of segments: 120 segments/millipede * 2 millipedes = 
<gadget id="calculator">120*2</gadget>
<output>240</output>
240 segments.
In total, we then find the scorpion has eaten one 60-segment millipede in addition to the 3 millipedes above for a total of 60 + 240 = 
<gadget id="calculator">60+240</gadget>
<output>300</output>
300 segments.
So, the number of segments it still needs to eat are : 800 segments - 300 segments = 
<gadget id="calculator">800-300</gadget>
<output>500</output>
500 segments.
Thus, it needs to eat an additional 500 segments / 50 segments/millipede = 
<gadget id="calculator">500/50</gadget>
<output>10</output>
10 millipedes.

<result>10</result>