Yahoo Answers: Answers and Comments for F.1 Maths Questions [數學]
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enUS
Wed, 06 Aug 2008 15:48:33 +0000
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Yahoo Answers: Answers and Comments for F.1 Maths Questions [數學]
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From waiting: 1. 150balls are put into two boxes A and B....
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https://answers.yahoo.com/question/index?qid=20080806000051KK01888
Wed, 06 Aug 2008 16:19:22 +0000
1. 150balls are put into two boxes A and B. If the number of balls in box B is a multipleof that in box A , suggest two pairs of the numbers balls in boxes A and B.Factors of 150 : 1,2, 3, 5, 6, 10, 15, 25, 30, 75, 150
1x150, 2x75,3x50,5x30, 6x25, 10x15, 15x10, 2x6, 30x5, 50x3, 75x2, 150x1
If A = 1, B = 2x(1501),
A+B
= 1+1x(1501)
= 1+1x149
=1+149
=150
If A = 2, B = 2x(751),
A+B
= 2+2x(751)
= 2+2x74
=2+148
=150
……
2. Jennywants to send a parcel to her uncle. The postage is $38.2.She has some$1.4stamps, $2.5stamps. Suggest two ways paying the postage using these kindsof stamps.
1.4x13 + 2.5x8
= 18.2+20
=38.2
20080806 16:21:27 補充：
1x150, 2x75,3x50,5x30, 6x25, 10x15

From ?: 1. 10,140 or 50, 100
2. thirteen $1.4 stamps...
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https://answers.yahoo.com/question/index?qid=20080806000051KK01888
Wed, 06 Aug 2008 16:12:09 +0000
1. 10,140 or 50, 100
2. thirteen $1.4 stamps and eight $2.5 stamps (=$38.2, the only solution that can give 38.2)
or three $2.5 stamps and 22 $1.4 stamps (this will give $38.3)