Question 385512
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Hi,         
Let x represent how many cats did he saw
Question Sets Up the Proportion..cats to dogs seen
 {{{2/5 = x/40}}}
Cross Multiply to solve for x
  5x = 2*40
  5x = 80
   x = 16, how many cats did he saw

CHECKING our Answer
   2/5 = 16/40 =  2/5