exam Maths Puzzle Numerical Ability

[ 10 5 18]
[ 4 -15 -5]
[ 1 8 0 ]

[ -7 2 -14]
[ 17 3 -13]
[ 16 15 10]

A [-30 10 -15 -

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exam Other Question

How do I solve for the absolute value inequality:

x > 6 When 3 times a certain number N is added to 6, the sum is 20 more than the original number. What is the number N?