Question
The total number of students in class X and Y is 72. The
number of students in X is 40% more than that in Y. The average marks of students in Y are 50% more than that of students in X. If the average marks of all the students in X and Y are 58, then what are the average marks of students in X?Solution
Let the number of students in class Y is x then the number of students in class X will be = 1.4a Let the average marks of students in class X is b then the average marks of students in class Y will be = 1.5b Now given, average of both the class is 58. Thus, (1.4a × b + a ×1.5b)/(a+1.4a) =58 1.4b +1.5b =58×2.4 b = (58×2.4)/2.9 b=48.
The SI unit for measuring energy is:
Which network topology uses a central node to connect all other nodes?
What is the purpose of DHCP in networking?
The search key used in Index file is also used to physically order the database and search key is the primary key or candidate key of the database. <...
In a circuit with n mesh currents, how many essential KVL equations are written when performing mesh analysis?
- Which one of the following algorithm design techniques is used in finding all pairs of shortest distances in a graph?
Which of the following is an essential property of an inductor?
What is an algorithm?
Which type of power plant uses mirrors or lenses to concentrate sunlight and generate electricity?
What is the role of the catch block in exception handling?
Relevant for Exams:
