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:

5 2 r+6 h=500 r+h=60  6h+10r=500 h+r=60  h=25 r=35  d=rh=3525=10

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