​Students at Mina Middle School brought quarters ​for the annual charity drive. A total of $188 was ​collected. If each student contributed one quarter, ​how many students contributed to the charity drive? ​​​Students at Mina Middle School brought quarters ​for the annual charity drive. A total of $188 was ​collected. If each student contributed one quarter, ​how many students contributed to the charity drive? ​