1.

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

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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