Final answer:
To stain the ramp, you would need to buy 2 quarts of stain.
Step-by-step explanation:
To determine how many quarts of stain you should buy to stain the ramp, you need to know the area of the ramp. Let's assume the area of the ramp is 200 square feet. Since a quart of stain covers 100 square feet, you can divide the area of the ramp by the coverage of one quart: 200 / 100 = 2 quarts. Therefore, you should buy 2 quarts of stain to stain the ramp.