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By: jentankq (offline)  Tuesday, March 02 2010 @ 09:13 PM CST (Read 2807 times)  

In the farm, Mr Johnson has 30 chickens and pigs altogether. The animals have a total of 100 legs. Find the number of chickens and the number of pigs that Mr Johnson has.

Can anybody solve this problem and shows the working.

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By: syun (offline)  Friday, March 05 2010 @ 12:15 PM CST  

every animal has at least 2 legs. So the 30 heads, accounts for 60 legs(30x2), leaving us with 40 legs(100-60) unaccounted for. Each pig still needs 2 more legs, so the 40 additional legs gives you enough for 20 pigs(40 / 2{unaccounted legs}). So we have 20 pigs and 10 chickens.


20 pigs(4 legs) = 80 legs
10 chickens (2 legs) = 20 legs

total 100 legs

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