book Maths Puzzle Numerical Ability

graph on a number line: |x|-3>-1 ; D = {Reals}

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book Other Question

On a recent safari, a group of people and elephants contained 100 knees and 100 trunks. If each person took 3 trunks, how many people and how many elephants went on the safari? How do you find the answer for the absolute value of |6x-13|=3?