A total of 50 tickets were sold for a school play. Adult tickets cost $8 each and child tickets cost $3 each. If the total revenue from ticket sales was $290, how many adult tickets were sold?

✓ Correct Answer: Option B

Let 'a' be adult and 'c' be child tickets. Equations are a + c = 50 and 8a + 3c = 290. Substitute c = 50 - a into the second equation: 8a + 3(50 - a) = 290. Solving gives 5a = 140, so a = 28.