If the total number of boys in electrical mechanical and civil together is 3096 while the total numb...........

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.

If the total number of boys in electrical, mechanical and civil together is 3096 while the total number of boys in Computer Science, Electronics and Mechanical together is 2520. Find the ratio of Boys and Girls in Mechanical Department.

5:3

2:1

5:2

7:6

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Explanation:

Let total number of students be 100x
total number of students in mech= A
3/5 *25x + A + 1/3*12x= 2520
=>A= 2520-19x — (i)
similarly;
A= 3096- 63x/4 – 45x/4 –(ii)
solve (i) and (ii) and get x=72
so total students=7200
find A from eq (i) or (ii)
we get A= 1152
total students in mech= 24% of 7200= 1728; hence girls= 576
ratio= 1152:576=2:1