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The average (arithmetic mean) of y numbers is x. If 30 is ad [#permalink]
30 Jun 2018, 09:52

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The average (arithmetic mean) of y numbers is x. If 30 is added to the set of numbers, then the average will be x - 5. What is the value of y in terms of x ?

Re: The average (arithmetic mean) of y numbers is x. If 30 is ad [#permalink]
01 Jul 2018, 12:50

1st condition states that (Sum of numbers) / Total numbers (y) = x ---> Rearranging Sum of Numbers = y * x ---> (1)

2nd Condition states that (Sum of Numbers + 30) / Total Numbers (y + 1) = (x - 5) ----> Rearranging Sum of Numbers + 30 = (x - 5) * (y + 1) Substituting from (1) and solving y = x/5 - 7.....which is D above

greprepclubot

Re: The average (arithmetic mean) of y numbers is x. If 30 is ad
[#permalink]
01 Jul 2018, 12:50