Ms. Jones got thank you cards from 30% of her class. 1/3 of these contained a gift card for $10. If she got $50 in gift cards, how many students were in her class? Let's answer step by step:
She got 5 gift cards because 50 / 10 = 5. She got 15 thank you cards because 5 / (1 / 3) = 15. She has 50 students because 15 / .3 = 50. The answer: 50.