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DS - word problem

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DS - word problem

by Xbond » Mon Sep 22, 2008 4:53 am
At a certain pet shop, 1/3 of the pets are dogs and 1/5 o f the pets are birds. How many ot hte pets are dogs ?
(1) There are 30 birds at the pet shop
(2) There are 20 more dogs than birds at the pet shop

Could explain it ? How you formulate the (2), Dogs = birds+20 ?
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Source: — Data Sufficiency |
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by mals24 » Mon Sep 22, 2008 5:09 am
IMO D

Let x be the total number of pets
dogs = (1/3)x
birds = (1/5)x
Dogs=?

St 1 birds = 30

(1/5)x=30
x=150
dogs = 50------SUFF

St 2 Dogs = Birds + 20

(1/3)x=(1/5)x+20

Solving the equ x=150 and dogs = 50-----SUFF
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by Xbond » Mon Sep 22, 2008 5:25 am
thks dude !
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by bhumika.k.shah » Tue Feb 02, 2010 7:16 am
this seems so simple. and yet i made a mistake! :-(

i realised the answer to be D the very moment i moved on to the next question :-(
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