book Maths Puzzle Numerical Ability

How many liters of 37 percent alcohol solution should a chemist mix with 20 liters of 16 percent alcohol solution to get 25% solution? You need to attach the unit L to your answer.

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book Other Question
How can you prove that:

odd + odd = even
even + even = even (you initially put even + even = odd)
odd + even = odd

???? find the gcf of (6y^2 - 3y) (y + 7)