a total of 348 tickets were sold for the school play. they were either adult tickets or student tickets. the number of student tickets sold was three times the number of adult tickets sold. how many adult tickets were sold?
1. let x be the sold tickets for adults
3x be the sold tickets for students
x + 3x = 348
4x = 348
x= 87 tickets for adults
2. let x be the no. of books produced
41664 + 8.5x = 19x
41664 = 19x - 8.5x
41664 = 10.5x
x = 3968 books
