Question

please help will fan and medal correct answers!!!!

Answer 1

Tickets to a concert cost $2 for children and $5 for adults. If 630 people attended the concert and the ticket sales totaled $2,910, how many children attended the concert?


36



50



80



120

Answer 2

Let the number of children who attended be [c] and adults [a].
\[\frac{\begin{array}{} c+a=630 \hspace{0.9cm} Ec.1 \\ 2c+5a=2\,910 \hspace{0.25cm} Ec.2 \end{array}} { \dfrac{\begin{matrix} -2c-2a=-1\,260 \\ 2c+5a=2\,910 \end{matrix}}{3a=1650} } \\a=550 \\ \Rightarrow c=630-550=80\]

Answer 3

thanks man