Data Sufficiency

Is there a good/quick method to solving this?


To receive a driver license, sixteen year-olds at Culliver High School have to pass both a written and a practical driving test. Everyone has to take the tests, and no one failed both tests. If 30% of the 16 year-olds who passed the written test did not pass the practical, how many sixteen year-olds at Culliver High School received their driver license?

(1) There are 188 sixteen year-olds at Culliver High School.

(2) 20% of the sixteen year-olds who passed the practical test failed the written test.

OA C

Refer to https://www.beatthegmat.com/ds-9-t8720.html

(Stuart one of the gmat expert on this site has also posted his solution in the link above)

Good luck!