book Maths Puzzle Numerical Ability

wHAT IS AN ABSOLUTE VALUE?

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A scientist has to make 800ml of 61% sulfuric acid solution. He has available a one liter bottle of 40% sulfuric acid solution and a one liter bottle of 75% sulfuric acid solution. can anyone answer this question?
Find the coordinates of the image of a segment whose endpoints are D(-2,3)and K(1,2)after each transformation.
1. a translation of right 4 and do