Ed bought a bottle of fancy mustard that holds 8.5 ounces. Ed puts about 1/25 of the mustard on each hot dog he eats. How much of the mustard is left in the bottle after he eats 7 hot dogs?

He will then have left:

To find out how much mustard is left in the bottle after Ed eats 7 hot dogs, we need to calculate the total amount of mustard he uses for the hot dogs and then subtract that from the initial amount.

First, we find out how much mustard Ed uses for each hot dog: ( \frac{1}{25} ) of the mustard is used for each hot dog.

So, the total amount of mustard used for 7 hot dogs is ( 7 \times \frac{1}{25} = \frac{7}{25} ) of the bottle.

Now, we subtract the amount used from the initial amount: Initial amount of mustard = 8.5 ounces

Amount used for 7 hot dogs = ( \frac{7}{25} ) of 8.5 ounces

Subtracting the amount used from the initial amount gives us the amount left: ( 8.5 \text{ ounces} - \frac{7}{25} \times 8.5 \text{ ounces} )

Calculating this, we find: ( 8.5 \text{ ounces} - \frac{7}{25} \times 8.5 \text{ ounces} ) ( = 8.5 \text{ ounces} - 2.38 \text{ ounces} ) ( ≈ 6.12 \text{ ounces} )

So, after eating 7 hot dogs, Ed has approximately 6.12 ounces of mustard left in the bottle.