Legs

Cancer has 5 pairs of legs. The insect has 6 legs. 60 animals have a total of 500 legs. How much more are cancers than insects?

Correct answer:

d =  10

Step-by-step explanation:

$$\begin{gathered} 5\cdot 2\cdot r+6\cdot h=500 \\ r+h=60 \\ 6h+10r=500 \\ h+r=60 \\ h=25 \\ r=35 \\ d=r-h=35-25=10 \end{gathered}$$

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