Let the smaller part be x. Then the larger part = 16 − x.
According to question , we have
2( larger part )2 - ( smaller part )2 = 164
Now , 2( 16 - x )2 - x2 = 164
⇒ 2( 256 + x2 - 32x ) - x2 = 164
⇒ x2 - 64x + 348 = 0
⇒ x2 - 6x - 58x + 348 = 0
⇒ x(x - 6) - 58(x - 6) = 0
⇒ (x - 6) (x - 58)
x = 6 or x = 58
But m = 58 is not possible, since sum of the two parts is 16
∴ smaller part ( x ) = 6,
∴ other part = 16 - x = 16 - 6 = 10.
Hence , required answer will be option A .