Twenty percent of the computer technicians have passed the certification test conducted by Bangladesh Computer Somity (BCS). Among the technicians who have not passed the test, 21 have taken a preparatory course and 15 have not taken the course. How many computer technicians are there?
Solution
Correct Answer: Option D
30% have passed so failed =(100-30 )%=70% total failed= 21+15=36 here, 70% =36 100%=36 x 100/70 =45
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