? asked in 科學及數學數學 · 1 decade ago

F.1 Maths Questions

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.

2 Answers

Rating
  • 1 decade ago
    Favorite Answer

    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

    Source(s): myself
  • ?
    Lv 5
    1 decade ago

    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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