BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

geometry from gmatprep

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 109
Joined: Mon Sep 08, 2008 12:47 am

geometry from gmatprep

by smallsorrow » Tue Sep 30, 2008 9:32 am
A square playground has the same area as a rectangular playground that is 30 feet longer but 20 feet narrower. What is the length, in feet, of a side of the square playground?
A) 10 radical 5
B) 10 radical 6
C) 25
D) 50
E) 60

Is there a way to avoid the quadratic equation?
Top
Source: — Problem Solving |
User avatar
Legendary Member
Posts: 871
Joined: Wed Aug 13, 2008 7:48 am
Thanked: 48 times

by stop@800 » Tue Sep 30, 2008 9:38 am
yes

s2 will cancel out and thr will not be any quadretic

a*a = (a+30)(a-20)
solve it
a = 60 [a^2 on both sides will cancel out]
Top
Master | Next Rank: 500 Posts
Posts: 109
Joined: Mon Sep 08, 2008 12:47 am

by smallsorrow » Tue Sep 30, 2008 9:55 am
Ah ... Get it - did not see it this afternoon! Thanks!
Top
Legendary Member
Posts: 574
Joined: Sun Jun 01, 2008 8:48 am
Location: Bangalore
Thanked: 28 times

by vishubn » Tue Sep 30, 2008 10:00 am
yes,
kinda straight....

area of a sq=area of rect

L*L=(L+30)(L-20)
L^2=L^2-20L+30L-600
-20L+30L-600=0
L=60

Hope this helps

Vishu
Top
Post new topic Post Reply
• Page 1 of 1