Question:
Gas cost $3.50 for regular, $3.70 for premium. If you get 30 MPG using regular, what MPG do you need to get to save money if you use premium?

Options:
1. 28.6 MGP
2. 30.0 MPG
3. 30.8 MPG
4. 31.7 MPG
5. I don't know.

Answer:
This is a straightforward math question.

30/3.50 = X/3.70

If we rearrange the equation for clarity.
X/3.70 = 30/3.50

X = (30/3.5) * 3.70

X = 31.7

At these prices, if you use premium gasoline and you get at least 31.7 MPG then you will be saving money on the amount you pay for the gas.