## Algebra 1

$8 \space L$
As per the given statement let us consider $a$ be the amount of solution with quantity of acid 70% and $b$ be the amount of solution with quantity of acid 45%. Thus, $a+b=20$ ...(1) and $0.7a+0.45b=0.6(20)$ ...(2) From equation (1), we have $a=20-b$ Plug $a=20-b$ in $0.7(20-b)+0.45b=0.6(20)$ $14-0.7b+0.45b=12$ $b=8 \space L$ Hence, the correct answer is $8 \space L$.
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