high temperature

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sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Mon Mar 16, 2009 3:01 am

The average (arithmetic mean) high temperature of five days, Monday through Friday was 86 degrees Farenheit; if Friday's high temperature reduced the average (arithmetic mean) high temperature of four days, that is Monday through Thursday, by 1 degree Farenheit, what was the high temperature, in degrees Farenheit, of Friday?

[spoiler]OA: 82 degrees Farenheit[/spoiler]

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Source: Beat The GMAT — Problem Solving | Mon Mar 16, 2009 3:01 am

Morgoth: Master | Next Rank: 500 Posts; Posts: 316; Joined: Mon Sep 22, 2008 12:04 amFollowed by: 1 member; Thanked: 36 times

Re: high temperature

by Morgoth » Mon Mar 16, 2009 8:04 am

sanju09 wrote:The average (arithmetic mean) high temperature of five days, Monday through Friday was 86 degrees Farenheit; if Friday's high temperature reduced the average (arithmetic mean) high temperature of four days, that is Monday through Thursday, by 1 degree Farenheit, what was the high temperature, in degrees Farenheit, of Friday?

[spoiler]OA: 82 degrees Farenheit[/spoiler]

M+T+W+TH+F = 86 * 5 = 430

if friday not included avg. of rest of the days

M+T+W+TH = 87 * 4 = 348

friday's temp = 430 - 348 = 82

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