T2W3 : How many cows?
There are 15 chickens, ducks and cows in the farm. They have 40 legs altogether. How many cows are there?
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“I have not failed. I've just found 10,000 ways that won't work.” Thomas Edison
chicken: 5 x 2 = 10
duck : 5 x 2 = 10
cow : 5 x 4 = 20
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Total: 15......=40 legs
Ans: There are 5 cows in the farm.
Ans : 5 cows
10 ducks + chickens
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