# SAT Math - Question Of The Day - 12 Jan 2017

**Q: Petrol costs x dollars half a gallon and y dollars per gallon. If a gallon of petrol costs 2 dollars less than 2 half-gallons, which of the following equations must be true?**

**Option:**

**a**. x - 2y + z = 0

**b. **2x - y + z = 0

**c.** x - y - z = 0

**d**. x + 2y - z = 0

Try to solve this question on your own! Do post your comments and solutions in the comment section below. Solution will be shared by next week on 19 Jan, 2017.