Every time Johnny turns his birthday, his parents throw as many coins into his piggy bank as he does years. At the moment it has 21 coins.
How old is Johnny?

6 years old
1+2+3+4+5+6=21

Every time Johnny turns his birthday, his parents throw as many coins into his piggy bank as he does years. At the moment it has 21 coins.
How old is Johnny?

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