In a group of cows and hens the number of legs are 14 more than twice the number of heads How many cows are in the group?
A
5
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B
7
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C
11
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D
12
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E
9
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Solution
The correct option is C 7 Let the number of cows be x and the number of hens be y then Number of legs in the group = 4x+2y Number of heads in the group = x+y ⇒ 4x + 2y = 2(x+y) + 14 which gives x =7