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40% of the total students in a class are boys. 75% of boys failed in a test. Boys who passed is what percent of total students of the class?1). 40%2). 18%3). 20%4). 10% |
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Answer» Let, Total number of STUDENTS in the class is x 40% of total students are boys ∴ Number of boys in the class = 0.40x 75% of boys failed in the test ∴ 25% of boys PASSED in the test Number of boys passed = 0. 25 × (0.40x) = 0.10x ∴ Required percentage $(= \frac{{Number\;of\;boys\;passed}}{{Total\;number\;of\;students}} \TIMES 100\%)$ $(= \frac{{0.10x}}{x} \times 100\%)$ = 10% |
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