Write a System of Linear Equations in Three Variables, and Then

question 132

Multiple Choice

Write a system of linear equations in three variables, and then use matrices to solve the system.
-There were approximately 100,000 vehicles sold at a particular dealership last year. The dealer tracks sales by age group for marketing purposes. The percentage of 36- to 59-year-old buyers and the percentage of buyers 60 and older combined exceeds the percentage of buyers 35 and younger by 40%. If the percentage of buyers in the oldest group is doubled, it is 34% less than the percentage of users in the middle group. Find the percentage of buyers in each of the three age groups.

• A) 30% 35 and younger; 58% 36-59 year olds; 12% 60 and older
• B) 32% 35 and younger; 55% 36-59 year olds; 13% 60 and older
• C) 24% 35 and younger; 60% 36-59 year olds; 16% 60 and older
• D) 12% 35 and younger; 58% 36-59 year olds; 30% 60 and older

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