maths problem
2007-11-28 4:33 am
The prices of a mouse-pad and a file-jacket are $35 and $48 respectively. Mr Chan wants to use 400 or less to buy 10 of them in total and as many file-jacket as possible.How any mouse-pads should he buy? Use inequality plaese.
回答 (2)
2007-11-28 4:50 am
✔ 最佳答案
Let x be the number of mouse-pads he should buy.35x + 48(10-x) <= 400
35x + 480 - 48x <= 400
-13x <=-80
x >= 80/13 = 6.154
Hence minimum number of mouse-pads that he should buy is 7.
2007-11-28 4:54 am
Let the number of mouse-pad and file-jacket be x and y
1)35x+45y<=400
2)x+y=10
.
.
3)x=10-y
Put 3 into 1
35(10-y)+45y<=400
350-35y+45y<=400
350+10y<=400
10y<=50
y<=5
Put y(5) into 2 (Because 5 is the max. no. of File-jacket)
x+5=10
x=5
So,he should buy 5 mouse-pads and 5 file jacket
1)35x+45y<=400
2)x+y=10
.
.
3)x=10-y
Put 3 into 1
35(10-y)+45y<=400
350-35y+45y<=400
350+10y<=400
10y<=50
y<=5
Put y(5) into 2 (Because 5 is the max. no. of File-jacket)
x+5=10
x=5
So,he should buy 5 mouse-pads and 5 file jacket
參考: Me
收錄日期: 2021-04-13 18:12:02
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