Joanna bought only $0.15 stamps and$0.29 stamps. How many : GMAT Data Sufficiency (DS)
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# Joanna bought only $0.15 stamps and$0.29 stamps. How many

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Manager
Joined: 22 Jul 2008
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Location: Bangalore,Karnataka
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Joanna bought only $0.15 stamps and$0.29 stamps. How many [#permalink]

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05 Jan 2010, 06:59
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Joanna bought only $0.15 stamps and$0.29 stamps. How many $0.15 stamps did she buy? (1) She bought$4.40 worth of stamps.
(2) She bought an equal number of $0.15 stamps and$0.29 stamps.
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Re: Joanna bought only $0.15 stamps and$0.29 stamps. How many [#permalink]

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05 Jan 2010, 07:25
A...
si) gives us total to be 4.4... for it to be true .29 cost stamps have to be in multiple of 5 as .15 ,the other cost is a multiple of 5....
possiblity of 5 or 10 or15 stamps of .29 cost.... a) 4.4-.29*5 is not divisible by .15 so not true..
b) 4.4-.29*10 is divisible by .15 so possible .. c) 4.4-.29*15 is not divisible by .15 so not true..
thus we get 10 of each...suff
sii) is not suff
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Manager
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Re: Joanna bought only $0.15 stamps and$0.29 stamps. How many [#permalink]

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05 Jan 2010, 10:17
Re: Joanna bought only $0.15 stamps and$0.29 stamps. How many   [#permalink] 05 Jan 2010, 10:17
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