1. **State the problem:** We need to find the total number of tickets sold on Friday and Saturday. 2. **Write the formula:** To find the total tickets sold, add the tickets sold on Friday and Saturday. $$\text{Total tickets} = \text{Tickets on Friday} + \text{Tickets on Saturday}$$ 3. **Substitute the values:** $$\text{Total tickets} = 125 + 178$$ 4. **Calculate the sum:** $$125 + 178 = 303$$ 5. **Answer:** The cinema sold a total of 303 tickets altogether on Friday and Saturday.