if 1 quart of a concentrate makes 15 gallons, how much of the concentrate will be needed to make one quart of the mixture

1 gallon = 4 quarts

1/60 = x/1

Cross multiply and solve for x.

To find out how much concentrate is needed to make one quart of the mixture, we need to use the given ratio of concentrate to gallons.

Given:
1 quart of concentrate makes 15 gallons

We can set up a proportion to determine the amount of concentrate needed for one quart of the mixture.

Let "x" represent the amount of concentrate needed for one quart.

1 quart of concentrate / x quart of mixture = 15 gallons of concentrate / 1 quart of mixture

Cross-multiplying, we get:

1 quart of concentrate * 1 quart of mixture = 15 gallons of concentrate * x quart of mixture

Simplifying further:

1 quart = 15 gallons * x

To isolate "x", we divide both sides of the equation by 15 gallons:

1 quart / 15 gallons = x

Therefore, the amount of concentrate needed for one quart of the mixture is 1/15 or approximately 0.0667 quarts.