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F.1 Maths Questions
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1. 150 balls are put into two boxes A andB. If the number of balls in box B is a nultiple of that in box A ,suggest two pairs of the numbers balls in boxes A and B.2. Jenny wants to send a parcel to her uncle. The postage is $38.2.She has some $1.4-stamps, $2.5-stamps. Suggest two ways paying the... 顯示更多 1. 150 balls are put into two boxes A andB. If the number of balls in box B is a nultiple of that in box A ,suggest two pairs of the numbers balls in boxes A and B. 2. Jenny wants to send a parcel to her uncle. The postage is $38.2.She has some $1.4-stamps, $2.5-stamps. Suggest two ways paying the postage using these kinds of stamps.
最佳解答:
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(150-1), A+B = 1+1x(150-1) = 1+1x149 =1+149 =150 If A = 2, B = 2x(75-1), A+B = 2+2x(75-1) = 2+2x74 =2+148 =150 …… 2. Jennywants to send a parcel to her uncle. The postage is $38.2.She has some$1.4-stamps, $2.5-stamps. Suggest two ways paying the postage using these kindsof stamps. 1.4x13 + 2.5x8 = 18.2+20 =38.2 2008-08-06 16:21:27 補充： 1x150, 2x75,3x50,5x30, 6x25, 10x15
其他解答:
F.1 Maths Questions
發問:
1. 150 balls are put into two boxes A andB. If the number of balls in box B is a nultiple of that in box A ,suggest two pairs of the numbers balls in boxes A and B.2. Jenny wants to send a parcel to her uncle. The postage is $38.2.She has some $1.4-stamps, $2.5-stamps. Suggest two ways paying the... 顯示更多 1. 150 balls are put into two boxes A andB. If the number of balls in box B is a nultiple of that in box A ,suggest two pairs of the numbers balls in boxes A and B. 2. Jenny wants to send a parcel to her uncle. The postage is $38.2.She has some $1.4-stamps, $2.5-stamps. Suggest two ways paying the postage using these kinds of stamps.
最佳解答:
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(150-1), A+B = 1+1x(150-1) = 1+1x149 =1+149 =150 If A = 2, B = 2x(75-1), A+B = 2+2x(75-1) = 2+2x74 =2+148 =150 …… 2. Jennywants to send a parcel to her uncle. The postage is $38.2.She has some$1.4-stamps, $2.5-stamps. Suggest two ways paying the postage using these kindsof stamps. 1.4x13 + 2.5x8 = 18.2+20 =38.2 2008-08-06 16:21:27 補充： 1x150, 2x75,3x50,5x30, 6x25, 10x15
其他解答:
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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)
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