A movie theater made $1267.50 on monday by selling 180 tickets. Adult tickets were $7.50 each and a child ticket was 6. Which system below could be used to find the number of adults that attended the movie on monday ?
A. {a+c=180
{a+c=1267.5

B. {a+c=1267.5
{7.5a + 6c=180

C. {a+c=180
{7.5a+ 6c=1267.5

D. {a+c=180
{7a+6.5c=1267.50

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