it takes 1 cup of liqiud fertilizer to make 7 1/2 gallons of spray. How much liquid is needed to make 80 gallons of spray?

80/7.5 = 10.666666 = 10 2/3

To find out how much liquid fertilizer is needed to make 80 gallons of spray, you can set up a proportion using the given information.

We know that 1 cup of liquid fertilizer makes 7 1/2 gallons of spray. Let's convert this fraction to a decimal:

7 1/2 = 7 + 1/2 = 7.5 gallons.

Now, we can set up the proportion:

1 cup / 7.5 gallons = x cups / 80 gallons.

To solve for x (the amount of liquid fertilizer needed for 80 gallons of spray), we can cross-multiply and solve for x:

1 * 80 = 7.5 * x.

80 = 7.5x.

Now, divide both sides of the equation by 7.5 to isolate x:

x = 80 / 7.5.

By doing this division, we find that:

x ≈ 10.67 cups.

Therefore, approximately 10.67 cups of liquid fertilizer are needed to make 80 gallons of spray.

To find out how much liquid is needed to make 80 gallons of spray, we need to determine the ratio between the amount of liquid fertilizer and the volume of spray it produces.

Given that 1 cup of liquid fertilizer makes 7 1/2 gallons of spray, we can set up the following proportion:

1 cup / 7 1/2 gallons = x cups / 80 gallons

To solve for x (the unknown amount of liquid fertilizer needed for 80 gallons of spray), we can cross-multiply and solve for x.

(1 cup) * (80 gallons) = (7 1/2 gallons) * (x cups)

80 cups = (15/2) * x

To isolate x, we can multiply both sides of the equation by 2/15:

(80 cups) * (2/15) = [(15/2) * x] * (2/15)

16/3 cups = x

So, to make 80 gallons of spray, you would need approximately 16/3 cups (or 5 1/3 cups) of liquid fertilizer.