Answer :

If the medium bottle contains 70% as much juice as the large bottle, then the medium bottle contains 375 milliliter of juice  

The quantity of juice contains in the large bottle = 500 milliliter

The percentage of juice contains in medium bottle = 75%

The quantity of juice in the  medium bottle = The quantity of juice contains in the large bottle × (The percentage of juice contains in medium bottle /100)

Substitute the values in the equation

The quantity of juice in the  medium bottle = 500 × (75/100)

Divide the numbers

= 500 × 0.75

Multiply the numbers

= 375 milliliter

Therefore, the medium bottle contains 375 milliliter of juice

I have answered the question in general, as the given question is incomplete

The complete question is:

A large bottle of juice contains 500 milliliters of juice. A medium bottle contains 70% as much juice as the large bottle. How many milliliters of juice are in a medium bottle?

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