Given:
Lakisha drinks 35% of water
Let the amount of water she did not drink be x
Using the formula below, we can solve for x
[tex]x\text{ \% + \%water she drank = 100\%}[/tex]Substituting and solving for x:
[tex]\begin{gathered} x\text{ + 35 = 100} \\ x\text{ =100 - 35} \\ \text{ x = 65\%} \end{gathered}[/tex]Re-writing using fractions and simplifying:
[tex]\begin{gathered} x\text{ = }\frac{65}{100} \\ =\text{ }\frac{13}{20} \end{gathered}[/tex]Answer: Option B