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Question

# Number of girls enrolled in B.Tech.(electronics) forms approximately. What percent of total number of students in the college?

A
7%
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B
13%
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C
15%
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D
22%
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E
24%
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Solution

## The correct option is C 15%Number of students in the college =7200 Number of boys =712×7200=4200 Number of girls =512×7200=3000 Number of student in B.Tech (nano technology) =22% of 7200=1584 Number of girls in B.Tech (computer science) =16% of 3000 =480 Number of boys in B.Tech.(mechanical)=18% of 4200 =756 Number of girls in B.Tech (civil) =30% of 480 =144 Number of boys in B.Tech.(electronics) =15% of 4200=630 Number of boys in B.Tech.(computer science)=50% of 480=240 Number of girls in B.Tech.(aerospace) =15% of 3000=4500 Number of boys in B.Tech.(civil) =31×144=432 Number of students in B.Tech (electronics) =24% of 7200 =1728 ∴ Number of girls in B.Tech (electronics) =1728-630=1098 Number of boys in B.Tech.(aerospace) =125×450=1080 Number of boys in B.Tech.(nano technology) =Remaining Number of boys =4200-(756+630+240+432+1080) =4200-3138=1062 ∴ Number of girls in B.Tech (nano technology) =1584-1062=522 Number of girls in B.Tech.(Mechnical)=Remaining Number of girls =3000-(480+144+450+1098+522)=3000-2694=306 Tabular form of above information is shown below. SubjectsNumber of boysNumber of girlsB.Tech.(computer science)240480B.Tech.(mechanical)756306B.Tech.(civil)432144B.Tech.(electronics)6301098B.Tech.(aerospace)1080450B.Tech.(naon technology)1062522Total42003000 Number of girls enrolled in B.Tech (electronics)=1098 ∴ Required percentage =10987200×100% =15.25%≃15%

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