1. The problem asks for the ratio of curries to salads sold by the restaurant on Thursday. 2. From the given data: On Thursday, salads sold = 12 and curries sold = 8. 3. Write the ratio of curries to salads as $8:12$. 4. Simplify the ratio by dividing both numbers by their greatest common divisor, which is 4: $$\frac{8}{4} : \frac{12}{4} = 2 : 3$$ 5. Therefore, the simplest form of the ratio of curries to salads sold on Thursday is $2:3$.