to find no. of swans

Asked by meghapte | 7th Feb, 2010, 10:43: AM

Expert Answer:

Let N be the total numbe of swans,

Swans at shore + Swans in water, swimming = Total number of swans.

7N /2 + 2 = N

7N /2  = N - 2

Sqaring both sides,

49N/4 = N2 -4N + 4

49N = 4N2 -16N + 16

4N2 - 65N + 16 = 0

N = [65±(652-4x16x4)]/8 = [65±63]/8 = 128/8 = 16.

Total number of swans are 16.

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TopperLearning. 

 

 

Answered by  | 7th Feb, 2010, 11:19: AM

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