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?
She got 5 gift cards because 50 / 10 = <<50/10=5>>5
She got 15 thank you cards because 5 / (1/3) = <<5/(1/3)=15>>15
She has 50 students because 15 / .3 = <<15/.3=50>>50
#### 50