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Joe has a collection of 280 sports cards. If 30% of them are
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12 Sep 2019, 10:37
12 Sep 2019, 10:37
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Joe has a collection of 280 sports cards. If 30% of them are baseball cards, 25% of them are football cards, and the rest are basketball cards, how many basketball cards does Joe have?
A. 70
B. 84
C. 126
D. 154
E. 196
Kudos for the right answer and explanation
A. 70
B. 84
C. 126
D. 154
E. 196
Kudos for the right answer and explanation
Re: Joe has a collection of 280 sports cards. If 30% of them are
[#permalink]
13 Sep 2019, 04:56
13 Sep 2019, 04:56
1
Instead of taking out \(30%\) of 280 and again taking out 25% of 280 and then adding the sum and finally reducing the sum from 280 is a time consuming method.
Easier way is taking out 45% of 280 because \(30% + 25% = 55%\) which comprises of cards of other types. However we are interested in basketball cards which is \(100 - 55 = 45%\) of total
\(45%\) of \(280 = 126\)
Still time saving method is to understand that \(50%\) of \(280 = 140\) and \(45%\) is slightly less than that therefore option C is a viable option.
Easier way is taking out 45% of 280 because \(30% + 25% = 55%\) which comprises of cards of other types. However we are interested in basketball cards which is \(100 - 55 = 45%\) of total
\(45%\) of \(280 = 126\)
Still time saving method is to understand that \(50%\) of \(280 = 140\) and \(45%\) is slightly less than that therefore option C is a viable option.
gmatclubot
Re: Joe has a collection of 280 sports cards. If 30% of them are [#permalink]
13 Sep 2019, 04:56
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