20 numbers averaged to 40, if 25 and 55 are two numbers which are subtracted from the list, the new average become
Question
20 numbers averaged to 40, if 25 and 55 are two numbers which are subtracted from the list, the new average become
Solution
The original total sum of the 20 numbers is 20 * 40 = 800.
When you remove the numbers 25 and 55, the new total sum becomes 800 - 25 - 55 = 720.
The new list now has 20 - 2 = 18 numbers.
So, the new average is 720 / 18 = 40.
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