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Question

Out of a group of swans, 72 times the square root of the number is playing on the shore of a tank. The two remaining ones are playing with the amorous fight, in the water. What is the total number of swans?

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Solution

Let the total number of swans be x

Now, x=72x+2

x72x2=0

Let x=y

y2=x

x72x2=0 becomes

y272y2=0

2y27y4=0

2y28y+y4=0

2y(y4)+1(y4)=0

(2y+1)(y4)=0

2y+1=0,y4=0

2y=1,y=4

y=12,4

x=12,4 where y=x

x=4 and x=14 swans are meaningless

x=16 by squaring

Hence, the total number of swans is 16

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