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

# Answer

50
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
50
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?
train