Question
In an examination, the average marks obtained by the
students is 85. After correcting the quantitative mistakes, the average of 100 students is reduced to 70 from 85 and the overall average of the student is reduced to 80. Then find the total number of students who participated in that examination?Solution
Let the total number of students be x Average marks obtained by the students = 85 Total marks = 85x After correcting the quantitative mistakes the average decreased by (85 - 70) = 15 marks Total reduction = 15 × 100 = 1500 Now According to the Question, (85x - 1500)/x = 80 80x = 85x – 1500 x = 300 Total number of students = 300
Alternate method: By alligation method, 
Total number of students = 200+100 = 300
How much did India pay for the procurement of 12 Su-30MKI aircraft from HAL?
What is the borrowing limit set by SEBI for Category I and II Alternative Investment Funds (AIFs) recently?
Nation First Transit Card has been launched to provide seamless and convenient customer commuting experience and ensure easy digital ticketing fare paym...
Which thematic area received the largest share of CSR spending by CPSEs in FY25, according to the Public Enterprises Survey?
Which country topped the medal tally at the ISSF World Cup 2026 Rifle/Pistol event in Granada, with how many gold medals?
The Speaker of the Lok Sabha can submit his/her resignation to the:
What was the unemployment rate (UR) reported in September 2025?
The 11th Raisina Dialogue 2026 was jointly organised by Observer Research Foundation (ORF) and which ministry?
Under the revised scheme by the Coconut Development Board, what is the new subsidy per hectare for the Area Expansion Programme?
Which state panel is expected to submit a report on insurance GST exemptions by October 2024?
Relevant for Exams:
