OpenStax, Elementary Algebra 2e §5.4 Solve Applications with Systems of Equations · Exercise 54 · Algebra · Systems

Solve Applications with Systems of Equations · Exercise 54

The first graders at one school went on a field trip to the zoo. The total number of children and adults who went on the field trip was 115. The number of adults was $\frac{1}{4}$ the number of children. Solve the system
${c + a = 115 a = \frac{1}{4} c$
to find $c$ , the number of children and $a$ , the number of adults.

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OpenStax, Elementary Algebra 2e · §5.4 Solve Applications with Systems of Equations · Exercise 54

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