Astray dog ate 30 muffins. that was 3/4 of all of them. how many did you start with?

For this equation the dog ate 3/4 of the 30 muffins. You would have started with 40 since the dog ate 3/4. So, the dog ate 3/4 muffins, and you would have 10 remaining. 

Please let me know if this was right! Thanks!

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