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

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Explanation: 30% পাশ করলে পাশ করেনি = $(100 - 30)$% = 70%. $70\% = 12 + 30 = 42$ জন; অর্থাৎ $100\% = \frac{42}{70} \times 100 = 60$ জন।

যদি একটি কামান থেকে নিম্নলিখিত ৪টি বস্তুকে অনুভূমিক ভাবে নিক্ষেপ করা হয়, তবে কোনটি সবচেয়ে বেশি দূরে উড়ে যাবে?
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চিনির দাম ২০% কমল, কিন্ত চিনির ব্যবহার ২০% বৃদ্ধি পেল। এতে চিনি বাবদ ব্যয় শতকরা কত বাড়ল বা কমল?
২-এর কত শতাংশ ৮ হবে?
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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?