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?
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if 20 are pigs and 25% are pig then the total number of animals is 20*4 = 80
so 40% of 80 is 32.
why did you times the 20 by 4?
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