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Of the 800 sweaters in a certain store, 150 are red. How many of the red sweaters at the store are made of pure wool?
(1) 320 of the sweaters at the store are neither red nor made of pure wool
(2) 100 of the red sweaters at the store are not made of pure wool
(1) 320 of the sweaters at the store are neither red nor made of pure wool
(2) 100 of the red sweaters at the store are not made of pure wool
23 Apr 2012, 21:03
Kudos
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MBADreamzzz
Why do we assume no other material could be used to make the red sweaters? Why wouldn't 40 of the remaining sweaters be polyster instead of pure wool?
In that case wouldn't E be the appropriate answer?
In that case wouldn't E be the appropriate answer?
Actually we do not assume that. All sweaters in the world are either wool or NOT wool (any other material). Look at either of the diagrams below, there is a row saying "Not Wool", so all sweater out of 800 which are made of some other material than wool are distributed there.
Of the 800 sweaters in a certain store, 150 are red. How many of the red sweaters at the store are made of pure wool?
(1) 320 of the sweaters at the store are neither red nor made of pool wool:
Attachment:
(1).png [ 6.68 KiB | Viewed 62876 times ]
(2) 100 of the red sweaters at the store are not made of pure wool:
Attachment:
(2).png [ 6.3 KiB | Viewed 62806 times ]
Answer: B.
Hope it's clear.
General Discussion
jairus
Of the 800 sweaters in a certain store, 150 are red. How many of the red sweaters at the store are made of pure wool?
1) 320 of the sweaters at the store are neither red nor made of pool wool
2) 100 of the sweaters at the store are not made of pure wool
1) 320 of the sweaters at the store are neither red nor made of pool wool
2) 100 of the sweaters at the store are not made of pure wool
1) no information to come with pure wool red sweaters
2) 150-100= red pure wool sweaters
Ans. B.
