book Maths Puzzle Numerical Ability

I have a PROBLEM THAT SAYS ;;;;; TWICE THE DIFFERENCE OF A NUMBER AND 8 IS EGUAL TO THREE TIMES THE SUM OF THE NUMBER AND 3 : fIND THE NUMBER;;;;; i SET UP THE PROBLEM LIKE THIS 2(

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What is 10% of $35.00 and What is 10% of $30.00? Also what is 10% of $15.00? When graphing a linear inequality, how do you know if the inequality represents the area above the line?