anonymous
  • anonymous
on a farm there are three kinds of animals: pigs, cows and horses. 25% are pigs and 40% are cow. if there are 20 pigs how many horses are there?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
if 20 are pigs and 25% are pig then the total number of animals is 20*4 = 80 so 40% of 80 is 32.
anonymous
  • anonymous
why did you times the 20 by 4?
anonymous
  • anonymous
think about how 4 parts of 25% (or 1/4) make up the whole so 4 *25% = 100% in this case the value of 25% is 20 pigs to find out how many farm animals there are total you have to multiply the value you know (20 pigs) by 4 --> meaning there are 80 animals on the farm from there you find out how many horses there are

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anonymous
  • anonymous
*cows not horses
anonymous
  • anonymous
ok i get it...so there are 32 cows on the farm
anonymous
  • anonymous
so there are 48 horses?
anonymous
  • anonymous
well if there are 80 total animals and we know 20 are pig and 32 are cows you just have to set up 80-(20 +32) = # of horses

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