A movie buff owns movies on DVD and on Blu-ray in a ratio of 7:2. If she buys 4 more Blu-ray movies, that ratio would change to 13:4. If she owns movies on no other medium, what was the original number of movies in her library before the extra purchase?	Choose the correct choice:
A) 22
B) 28
C) 77
D) 99
E) 234
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) = 7x and b(D) = 2x   now from the next line the new eqn becomes 7x/ (2x + 6) = 11/4   Solving it 28x = 26x + 52   x =11   which means m (d) = 182 and b(d) =52   SO total initially is m(d) + b(d) = 234   234
<result>E</result>
A movie buff owns movies on DVD and on Blu-ray in a ratio of 7:2. If she buys 4 more Blu-ray movies, that ratio would change to 13:4. If she owns movies on no other medium, what was the original number of movies in her library before the extra purchase?