Question 966920
THe ratio of lemon juice to lemonade is 250 : 1000
 
Use this ratio to sub 750 mL of lemonade in

ie 

Ratio 1   -  250 : 1000
Ratio 2   -   x  : 750

therefore 250 / 1000 = x / 750  

* both sides of the equation by 750 so x is by itself

= 187.5 = x

Therefore 750 mL of lemonade must contain 187.5mL of lemon juice