M4maths Maths Puzzle Numerical Ability Alligation or Mixture

If 12 ounces of a strong vinegar solution are diluted with 50 ounces of water to form a three-percent vinegar solution, what was the concentration of the original solution?

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M4maths Other Question

If in coded language
DEMETRIC = 288
MITCHELL = -47
Then
KIERSTEN = ?
7,2,0,7,8,4,3, what is the next number?