Practice Quiz

GMAT Math Practice Test #1

Category - Math

Start a Study Session Sign up for Question of the Day

In an examination of 4 subjects, John gets 100, 60 and 55 in three subjects. If his average (arithmetic mean) marks for all four subjects is 75, then the marks in the 4th subject must be

  1. 82
  2. 85
  3. 88
  4. 91
  5. 93
Explanation

Answer B The average marks for all four subjects is 75 and so total marks are 4 x 75 = 300

The marks for three subjects are given and their total is 100 +60 + 55 = 215. Hence the marks for the fourth subject = 300- 215 = 85

Key takeaway: GMAT always refers to an average as average (arithmetic mean) The average ( arithmetic mean ) of a set of numbers is their sum divded by the number of numbers in the set. For average problems, think Total divided by number of items.

Previous Next
Was this helpful? Upvote!
Login to contribute your own answer or details
Start a Study Session Sign up for Question of the Day

Top questions

Related questions

Most popular on PracticeQuiz