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Mathematics, 08.12.2021 02:00 hmae2304

Help needed read carefully I got a 30 on a math test and t hmm e only way to get 65 (passing grade) is to solve the mystery number

I am a factor of 5 and when you pair me up with 15 I am almost a gcm of 30
I am larger than 20 and less than 40
what number am i?

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