When 10 boys and 10 girls from electrical department are transferred to Computer Science department ...........

Quantitative Aptitude ( CCS) Data Table

Study the following information and answer the questions that follow:
An engineering college has five branches as shown in the table. All the students study in these five branches. The ratio of number of boys to number of girls is given in the table and the percentage of student in any branch is also given. Some fields are blank you have to find the value as per the data given in each question and then solve the question.

When 10 boys and 10 girls from electrical department are transferred to Computer Science department the ratio of number of boys to number of girls in Computer Science changes from 3:2 to 55:37. Find the total number of boys and girls in electrical department after the transfer.

746

756

736

726

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Explanation:

Let total students be 100x
students in Computer science initially= 25x
boys= 3/5*25x=15x and girls= 10x
(15x + 10)/ (10x+10)=55/37
solve and get x= 36
=> total students =3600
hence students in electrical initially= 21% of 3600= 756
now 20 students are transferred so new number of student=756-20=736