Aspire's Library
A Place for Latest Exam wise Questions, Videos, Previous Year Papers,
Study Stuff for MCA Examinations
Study Stuff for MCA Examinations
Phrases Previous Year Questions (PYQs)
Phrases Averages PYQ
A set of consecutive positive integers beginning with
1 is written on the blackboard. A student came along
and erased one number. The average of the remaining
numbers is 35715. What was the number erased?
Go to Discussion
Solution
The mean of consecutive positive
integers from 2 to n is
Go to Discussion
Solution
Step-by-step:
- First term: 2
- Last term: n
- Total numbers: n − 2 + 1 = n − 1
- Sum: (n − 1)/2 × (2 + n)
- Mean: Sum ÷ (n − 1) = (n + 2)/2
✅ Final Answer: The mean of numbers from 2 to n is (n + 2) / 2.
Three cities A, B, C are equidistant from each other.
A motorist travels from A to B at 30km/hour, from B
to C at 40km/hour, and from C to A at 50km/hour.
Then the average speed is
Go to Discussion
Solution
Let distance is x ,so
time t1=x/30,
t2=x/40 and
t3=x/50.
From question same distance so total distance = 3x
total time = x/30+x/40+x/50
so
Average speed = total distance/ total time =3x/(x/30+x/40+x/50)= 1800/47=38.3km/h.
Solution Contribution by Priyanka Soni
Phrases
Online Test Series,
Information About Examination,
Syllabus, Notification
and More.
View More
Phrases
Online Test Series,
Information About Examination,
Syllabus, Notification
and More.
View More
Ask Your Question or Put Your Review.
