Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

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

1

This post received KUDOS

00:00

Question Stats:

83% (01:38) correct
16% (01:46) wrong based on 12 sessions

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