RRB Group-D 6th Dec 2018-shift -1
For the following questions answer them individually
Four words have been given of which three are alike in some way and one is different. Choose the odd one out.
The image formed by controlled rays of reflection that we get by extending the rays backwards:
The average marks obtained by a group of 25 students was 29. One student left the group as a result of which the average of the remaining students rose to 29.5. Afterwards, another student came in as a result of which the average marks of the group dropped to 28.8. What is the average of the combined marks obtained by the student who left and the one who joined?
Inlet Pipe A can fill a cistern in 35 hours while outlet Pipe B can drain the filled cistern in 40 hours. The two pipes are opened together when the cistern is empty, but the outlet pipe is closed when the cistern is three-fifths full. How many hours did it take in all to fill the cistern?
Consider the following question and decide which of the statements is sufficient to answer the question.
Question:Â
Find the value of n, if
Statements:
1) $$AB = A$$
2)$$A = \begin{bmatrix}n & 9 \\2 & 1 \end{bmatrix},$$ $$B = \begin{bmatrix}1 & 0 \\0 & 1 \end{bmatrix}$$
A and B can do a piece of work together in 9 days while A alone can do it in 15 days. They start working together but B leaves 3 days before the completion of the work. For how many days did A and B work together?
The following table shows the pass percentage of results of four schools in the past four years.
In which academic year did all the schools have pass percentage as more than 80?
