Find a number whose 6 1/4% is 12.

Let the required number be x.

6¹/₄% of x = 12

(25/4)% of x = 12

⇒ (25 / (4 × 100)) × x = 12

⇒ x = (12 × 4 × 100) / 25 = 192

Hence, the required number = 192.