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標題:

maths problem

發問:

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.

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最佳解答:

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.

其他解答:

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 jacketD1B39E804036C6BD