Answer
$35$$L$ $700$$mL$ OR
$35,700mL$
Work Step by Step
There are $1000$ $mL$ (milliliters) in a $L$ (liter).
So, either we leave the answer as just $35L$ and $700mL$ or convert the $L$ to $mL$ and add.
To convert $35L$ to $mL$, multiply $35$ $\times$ $1000$ $=$ $35,000$.
Then, add $35,000$ $+$ $700$ $=$ $35,700$.
So your answer could also be $35,700mL$
