Mary has $10 in savings. she owes her parents $50. she does some chores and her parents pay her $12. she also gets $25 for her birthday from her grandmother. does mary have enough money to pay her parents what she owes them? if not, how many more money does she need? explain

Let's start with what we know:
Mary needs at least $50 to pay back her parents
Currently, she has $10, $12, and $25 in her possession. Let's add those values together and see if they equal $50 or more:

10 + 12 + 25 
22 + 25 = $47

Since she only has $47, she needs $3 more to pay back her parents.

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