Four staff members at a certain company worked on a project. The amounts of time that the four staff members worked on the project were in the ratio 2 to 3 to 5 to 6. If one of the four staff members worked on the project for 15 hours, which of the following CANNOT be the total number of hours that the four staff members worked on the project?  Answers:
A) 40
B) 48
C) 80
D) 192
E) 120
Four members worked in ration 2:3:5:6, hence as everyone mentioned, individual work could be taken as 2x, 3x,5x, and 6x. Also this gives us total work as 16x.   But we are told that one of these individual works is 30hrs. hence, possible scenarios, if   (1)2x =15 =&gt; 16x = 120 (2) 3x =15 =&gt; 16x = 80 (3) 5x =15 =&gt; 16x = 48 (4) 6x =15 =&gt; 16x = 40   Hence Answer is 192 192 which can not be any of these.
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Four staff members at a certain company worked on a project. The amounts of time that the four staff members worked on the project were in the ratio 2 to 3 to 5 to 6. If one of the four staff members worked on the project for 15 hours, which of the following CANNOT be the total number of hours that the four staff members worked on the project?