The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?

Correct answer: 19

Solution

Since the average of 20 numbers is zero, their sum is also zero. To have the maximum number of positive numbers, 19 numbers can be positive and the 20th number can be negative enough to make the total sum zero.

Related IBPS PO Quantitative Aptitude questions

A set of five two-digit integers is given. The average of the first and last numbers is the middle number. The second number is half of the first number. The sum of the first three numbers is 127. The middle number is (A) and the average of the five numbers is (B). The fourth number is 62. What can be the values of (A) and (B), respectively?
When the digits of a two-digit natural number are interchanged, the original number is greater than three times the new number so obtained. How many such natural numbers are there? (Ignore the numbers which have 0 in the units place.)
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What percentage of numbers from 1 to 70 have 1 or 9 in the units digit?
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