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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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