You asked how to answer the farm leg type questions.
Here is how you do it:
Take the animal with the LEAST number of legs, either the chicken or the 3-legged cows when you have horses, and multiply the number of heads by 2 for chickens or 3 for 3-legged cows.
Your example: 46 heads x 3 (cows) = 138 legs
This tells you the minimum number of legs…
show moreYou asked how to answer the farm leg type questions.
Here is how you do it:
Take the animal with the LEAST number of legs, either the chicken or the 3-legged cows when you have horses, and multiply the number of heads by 2 for chickens or 3 for 3-legged cows.
Your example: 46 heads x 3 (cows) = 138 legs
This tells you the minimum number of legs you could possibly have.
Take the actual number of legs provided in the question and subtract the minimum number of legs you just found. This tells you the number of extra legs you need.
156 legs – 138 legs = 18 legs
Since the difference between the cows and the horses is one leg, you divide the 18 legs by 1, which is just 18. If they were chickens and horses you would divide by 2 not 1, since horses have 2 extra legs per head.
What that all means is that there must be 18 horses out of the 46 heads to equal 156 legs.
Take the 46 heads, subtract the 18 horses, equals 28 three-legged-cows.
18 horses x 4 legs = 72legs
28 cows x 3 legs = 84legs
72legs + 84legs = 156legs
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