Bunuel wrote:
The sum of 9 minutes, 50 seconds and x is 34 percent of one hour. What does x equal?
A. 50 minutes, 10 seconds
B. 34 minutes, 00 seconds
C. 10 minutes, 34 seconds
D. 20 minutes, 24 seconds
E. 39 minutes, 36 seconds
34% of an hour(3600 seconds) is 34/100 * 3600 = 34 * 36 = 35*35 - 1 = 1224 seconds.
Since we have 9 minutes and 50 seconds, which is 9*60 + 50 = 590 seconds
The remainder is 634 seconds(which is 10 minutes and 34 seconds) which must be added.
Therefore, x equal
10 minutes, 34 seconds(Option C)P.S When the answer options are far apart, approximations may work, but with close
answer options it makes sense to convert the time into seconds.
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79% (01:58) correct 
