Choose the pair that follows the same relationship: 225 : 15 :: ____ : ____

Pattern: the left number is the square of the right number, or number : square root.

For the given pair, 225 = 15 x 15, so the right term is the square root of the left term.

• 256 : 16 matches because 16 x 16 = 256.

• 324 : 17 does not match because 17 x 17 = 289.

• 196 : 13 does not match because 13 x 13 = 169.

• 216 : 15 does not match because 15 x 15 = 225.

Conclusion: only 256 : 16 follows the same relationship.