The lemonade does Rosanne'a brother drinks is [tex]1\div 2[/tex] liter
The remaining should be
[tex]= (1\ 1\div 2) -(1\div 4) \\\\= 1\ 2\div 4 -1\div 4 \\\\= 1\ 1\div 4 \ liters[/tex]
Since The brother drinks 2/5 of that,
So,
[tex]= (2\div 5)(1\ 1\div 4 L) \\\\= (2\div 5)(5\div 4 L) \\\\= 2\div 4 L \\\\= 1\div 2 L[/tex]
learn more: https://brainly.com/question/13981855?referrer=searchResults