It sounds like you're asking about a fuel mixture ratio. However, the phrase "50 1 for quart of gas" is a bit ambiguous. Here's why and what you need to clarify:

* What are you mixing with the gas? Fuel ratios typically involve mixing gasoline with oil (for small engines) or with another fuel like ethanol.

* What is the "50 1" referring to? Is it a 50:1 ratio, meaning 50 parts of gas to 1 part of the other substance? Or is it 1 part gas to 50 parts of the other substance?

To help you get the right answer, please provide the following information:

1. What are you mixing with the gas?

2. What does the "50 1" ratio actually mean?

Once I have this information, I can help you calculate the correct amount of each substance needed for a quart of gas.