A movie buff buys movies on DVD and on Blu-ray in a ratio of 17:4. If she returns 4 Blu-ray movies, that ratio would change to 9:2. If she buys movies on no other medium, what was the original number of movies purchased?  Select the correct option:
A) 22 B) 28 C) 77 D) 99 E) 378
if u can just keep an eye on the options   99 is the only multiple of 9 in options given .. SO you can mark it wid in seconds.   Now coming to the process m(D) = 17x and b(D) = 4x   now from the next line the new eqn becomes 17x/ (4x -4) = 9/2   Solving it 34x = 36x -36   x =18   which means m (d) = 306 and b(d) = 72   SO total initially is m(d) + b(d) = 378   378
<result>E</result>
A movie buff buys movies on DVD and on Blu-ray in a ratio of 17:4. If she returns 4 Blu-ray movies, that ratio would change to 9:2. If she buys movies on no other medium, what was the original number of movies purchased?