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aeager1: Newbie | Next Rank: 10 Posts; Posts: 2; Joined: Mon May 30, 2011 11:30 am

by aeager1 » Mon May 30, 2011 12:04 pm

Can someone show me how to solve this:
(20-n)+n+(18-n)=25

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Source: Beat The GMAT — Problem Solving | Mon May 30, 2011 12:04 pm

cans: Legendary Member; Posts: 1309; Joined: Mon Apr 04, 2011 5:34 amFollowed by: 123 members; Location: India; Thanked: 310 times; GMAT Score:750

by cans » Mon May 30, 2011 12:12 pm

(20-n)+n+(18-n)=25
well you can write it as:- 20-n+n+18-n=25
20+18-n=25
38-n=25
38-25=n
or n=13

Last edited by cans on Mon May 30, 2011 12:13 pm, edited 1 time in total.

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MBA.Aspirant: Master | Next Rank: 500 Posts; Posts: 401; Joined: Tue May 24, 2011 1:14 amFollowed by: 5 members; Thanked: 37 times

by MBA.Aspirant » Mon May 30, 2011 12:12 pm

(20-n)+n+(18-n)=25

20-n +n +18-n =25
38-n = 25
n = 38-25 = 13

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