Answer
$32 \space L$,$18 \space L$
Work Step by Step
As per the given statement let us consider $a$ be the amount of solution with quantity of acid 80% and $b$ be the amount of solution with quantity of acid 30%.
Thus,
$a+b=50$ ...(1)
and $0.8a+0.3b=0.62(50)$ ...(2)
From equation (1), we have $b=50-a$
Plug $b=50-a$ in $0.8a+0.3b=0.62(50)$
$0.8a+0.3(50-a)=0.62(50)$
$a=32 \space L$ and $b=50-32=18$ L
Hence, the answers are: is $32 \space L$,$18 \space L$
