If x^2 = 49 => x = 2 & x^2 = 64 => x = 1 Then x^2 = 144 => x = ?

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17 Aug 2009 square puzzle

If x^2 = 49 => x = 2
& x^2 = 64 => x = 1
Then x^2 = 144 => x = ?

OPtion

1. 4
2. 12
3. 7
4. 5
5. 2
6. 1
7. 3
8. 11
9. 10
10. 9

Solution

x^2 = 49 = 4 + 9 = 13 = 1 + 3 = 4
Hence x = √4 = 2
Similarly x^2 = 64 = 6 + 4 = 10 = 1 + 0 = 1
Hence x = √1 = 1
Similarly x^2 = 144 = 1 + 4 + 4 = 9
Hence x = √9 = 3

Correct Option: 7 Best Solution (1)