1. **State the problem:** A family spends 15 per person for zoo tickets and 5.50 for parking each day. They visit for two days, and the total cost is 191. We need to find the number of people, $x$, in the family. 2. **Write the equation:** The cost for one day is $15x + 5.50$. For two days, the total cost is twice that: $$2(15x + 5.50) = 191$$ 3. **Simplify the equation:** $$30x + 11 = 191$$ 4. **Isolate $x$:** $$30x = 191 - 11$$ $$30x = 180$$ 5. **Solve for $x$:** $$x = \frac{180}{30}$$ $$x = 6$$ 6. **Interpretation:** There are 6 people in the family who went to the zoo. **Final answer:** $x = 6$