Thirty percent of the members of a swimming club have passed the lifesaving test. Among the members who have not passed the test, 12 have taken the preparatory course and 30 have not. How many members are there in the swimming club?
A. 80
B. 60
C. 100
D. 120
E. None of these
Explanation: 30% পাশ করলে পাশ করেনি = \((100 - 30)\)% = 70%. \(70\% = 12 + 30 = 42\) জন; অর্থাৎ \(100\% = \frac{42}{70} \times 100 = 60\) জন।
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