mgb5e_ppt_2_7

mgb5e_ppt_2_7 - 2.7 Percent and Mixture Problem Solving...

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§ 2.7 Percent and Mixture Problem Solving

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Martin-Gay, Beginning Algebra, 5ed 2 Strategy for Problem Solving General Strategy for Problem Solving 1) UNDERSTAND the problem Read and reread the problem Choose a variable to represent the unknown Construct a drawing, whenever possible Propose a solution and check 2) TRANSLATE the problem into an equation 3) SOLVE the equation 4) INTERPRET the result Check the proposed solution in problem State your conclusion
Martin-Gay, Beginning Algebra, 5ed 3 Solving a Percent Equation A percent problem has three different parts: 1. When we do not know the amount : n = 10% · 500 Any one of the three quantities may be unknown. amount = percent · base 2. When we do not know the base : 50 = 10% · n 3. When we do not know the percent : 50 = n · 500

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Martin-Gay, Beginning Algebra, 5ed 4 Solving a Percent Equation: Amount Unknown amount = percent · base What is 9% of 65? n = 9% · 65 n = (0.09) (65) n = 5.85 5.85 is 9% of 65
Martin-Gay, Beginning Algebra, 5ed 5 Solving a Percent Equation : Base Unknown amount = percent · base 36 is 6% of what?

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