Book Maths Puzzle Algebra

Find two consecutive EVEN integers whose sum is 120. I know the answer but not how to solve it and show the work!

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Find two consecutive EVEN integers whose product is 120. I know the answer but not how to solve it and show the work! How many mL of water are needed to add to 5 mL of acid to make a 20% acid solution?

Can you show the answer in the factor label method?