SOLUTION: The mean of a set of numbers is 120. If one number is increased by 300, the mean equals 135. How many numbers are in the set?
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Question 359419: The mean of a set of numbers is 120. If one number is increased by 300, the mean equals 135. How many numbers are in the set?
Answer by jrfrunner(365) (Show Source): You can put this solution on YOUR website!
average = therefore
===
given
average=120 then we have the relationship
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also if one number is increased by 300 (this means that increases by 300) and the average =135
thus
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So you have two equations and two unknowns, solve for n
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subtract the second equation from the first
n=300/15=20
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