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The students of a class wrote an exam. `20%` of the boys and `30%` of the girls failed in it. The number of boys who passed in it was 30 more than that of girls. A total of 74 students failed in it. Find the strength of the class.A. 280B. 300C. 320D. 260 |
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Answer» Correct Answer - B Let the number of boys and girls who wrote the exam be b and g respectively. Total number of those who failed `=20/700b=70/100g+74" "(1)` `80%` of the boys passed and `70%` of the girls passed. `=80/100b=70/100g+30" "(2)` Solving (1) and (2), b = 160 and g = 140. `therefore"Total strength of the class"180+140=300` |
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