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Wrong question?

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Wrong question?

by himu » Wed Oct 16, 2013 8:35 pm
Lake A has a duck population of 30 females and 36 males. Lake B's duck population consists of the same ratio of females to males. If 6 new female ducks are added to Lake B and no other ducks are added or removed, the new total duck population of Lake B could be which of the following?

144
105
78
51
36


My QUERY--> Shouldnt it be : Lake B's duck population consists of the same ratio of females to males---> "as Lake A's "?????
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by mevicks » Wed Oct 16, 2013 8:51 pm
Lake A --> F/M = 30/36 --> 5/6

Lake B --> F/M = 5x/6x
Total = 11x
6 New ducks are added --> New total = 11x + 6

So the answer choice must be 6 more than a multiple of 11:
11*9 + 6 = 105

Answer B
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by mevicks » Wed Oct 16, 2013 8:58 pm
himu wrote:Lake A has a duck population of 30 females and 36 males. Lake B's duck population consists of the same ratio of females to males.
...
My QUERY--> Shouldnt it be : Lake B's duck population consists of the same ratio of females to males---> "as Lake A's "?????
The question seems alright to me.
Ratio = Something expressed as x/y and read as ratio of x to y (or x:y).
A's ratio can be found out and is the only ratio in question.
If the question was worded differently "consists of the same number of females to males" then that would have implied a ratio of 1:1 for B
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